Bone Health in the Elderly with Type 2 Diabetes Mellitus–A Systematic Review
Steno Diabetes Center Aarhus, Aarhus University Hospital, Aarhus, Denmark
Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
Steno Diabetes Center North Jutland, Aalborg University Hospital, Aalborg, Denmark
Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
Department of Internal Medicine, Regional Hospital Randers, Randers, Denmark
Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark
Department of Endocrinology and Internal Medicine, Aalborg University Hospital, Aalborg, Denmark
† These authors contributed equally to this work.
Academic Editor: P. Hemachandra Reddy
Special Issue: Diabetes in the Elderly
Received: April 02, 2020 | Accepted: May 29, 2020 | Published: June 18, 2020
OBM Geriatrics 2020, Volume 4, Issue 2, doi:10.21926/obm.geriatr.2002123
Recommended citation: Al-Mashhadi Z, Viggers R, Fuglsang-Nielsen R, Langdahl B, Vestergaard P, Gregersen S, Starup-Linde J. Bone Health in the Elderly with Type 2 Diabetes Mellitus–A Systematic Review. OBM Geriatrics 2020; 4(2): 123; doi:10.21926/obm.geriatr.2002123.
© 2020 by the authors. This is an open access article distributed under the conditions of the Creative Commons by Attribution License, which permits unrestricted use, distribution, and reproduction in any medium or format, provided the original work is correctly cited.
The average human lifespan has increased by 5.5 years over the last 16 years . Currently, the average life expectancy in Europe and the United States of America is 80.9 years and 78.7 years, respectively, with the highest life expectancy reported in women [2,3]. Consequently, the need for effective prevention and treatment of chronic aging-related diseases has increased. Type 2 diabetes mellitus (type 2 DM; T2DM) and osteoporosis are two common metabolic diseases among the elderly [4,5].
Increasing age is a significant risk factor for osteoporosis, as evidenced by the exponential increase in hip fracture incidence with age . The World Health Organization has defined the following diagnostic criterion for osteoporosis: bone mineral density (BMD) of ≥2.5 SD below the average value for young, healthy women, i.e., a BMD T-score ≤ −2.5 [6,7]. The T-score is derived from areal BMD (aBMD) measured using Dual-energy X-ray Absorptiometry (DXA) at the lumbar spine, femoral neck, or total hip. However, in a prospective study from 2004 conducted with elderly men and women aged ≥55 years, it was reported that only 21% and 44% of all non-vertebral fractures in men and women, respectively, occurred with an aBMD T-score below −2.5 . Therefore, there must be several important risk factors for fractures other than a relative reduction in the aBMD.
T2DM is a chronic metabolic disorder that arises due to insulin resistance and a relative insulin deficiency, resulting in elevated blood glucose levels . The risk of T2DM is reported to increase with age . Neither the Fracture Risk Assessment Tool (FRAX) nor aBMD sufficiently predict fracture risk in T2DM [11,12]. In fact, fracture risk is underestimated in T2DM, corroborating the hypothesis that bone quality is affected by T2DM [12,13]. T2DM is associated with an increased fracture risk despite consistent findings of unaffected or elevated aBMD [13,14,15,16]. Diabetic bones are characterized by a state of low bone turnover, which potentially leads to impaired bone quality [17,18]. Evidence suggests that T2DM is an independent risk factor for bone fragility and fractures as it exerts an effect on bone metabolism and aggravates the age-related impairment of bone quality . Therefore, bone health in the elderly with T2DM requires increased attention and improved assessment. However, the utility of aBMD as a clinical indicator of osteoporosis and fracture risk has significant limitations. Complementary tools are increasingly being used to assess the association of diabetes to bone fragility and fractures in the elderly. In addition, a higher aBMD T-score intervention threshold has been proposed for diabetic patients .
The present systematic review summarizes the current knowledge regarding bone health in the elderly with T2DM through discussion of structural and biochemical bone measurements as well as fracture risk.
The aim of the present review is to present the current knowledge on the effects of T2DM on bone, identify associated risk factors and confounders, and identify knowledge gaps in the field.
2. Materials and Methods
A systematic literature search was performed in accordance with the PRISMA guidelines [20,21] in the following three databases: PubMed, Embase, and CINAHL. The search strings were optimized through database-specific evaluation of the search terms. Search terms were used only if they influenced the number of articles yielded by the search. Each database has its own form of bibliographic indexing (for example, MeSH-terms in PubMed), and these indexing terms were identified for each database and added to the respective search strings. The search strings were made to yield articles satisfying the following three criteria: (1) contained a term representing “type 2 diabetes” in the title or abstract, (2) contained a term representing “elderly” in the title or abstract (or in the ‘age group’ category for CinAHL), and (3) contained a term representing “bone disease”, “fracture”, or “ bone turnover” in the title or abstract. The final literature search was performed on 29th October, 2019.
Table S1 lists the search terms used in the PubMed search. Table S2 provides the exact search strings. The initial search yielded 1,548 results. After removing duplicate articles, 1,204 articles remained. Two reviewers (RV and ZAM) independently assessed abstracts and subsequently full-text articles for eligibility according to the inclusion criteria. Disagreements were resolved through discussion.
Figure 1 illustrates the exclusion process described ahead. First, articles which were not available in English, German, Spanish, Italian, French, Norwegian, Danish, or Swedish were excluded. Next, articles reporting studies that were not human in-vivo studies were excluded. Subsequently, case reports, case series, posters, conference abstracts, reviews (without meta-analysis), letters to the editor, commentaries, expert opinions, and consensus statements were excluded. Finally, the remaining abstracts and articles were assessed to identify relevant study populations, exposures, and outcomes. Articles were included only if at least one subset of the study population had T2DM, satisfied the age criterion (see below), and was examined for relevant bone-related outcomes (see below). The age criterion was as follows: mean age ≥ 55 years, minimum age ≥ 50 years, or postmenopausal. Exposures were considered relevant if the study involved one of the following: 1) comparison of T2DM with non-diabetic subjects, 2) analysis of the effects of glycemic control (e.g., hemoglobin A1c [HbA1c] or fasting plasma glucose [FPG]), 3) assessment of the effects of insulin resistance (e.g., through homeostatic model assessment [HOMA]), 4) investigation of the effects of prevalent diabetic complications (e.g., neuropathy), or 5) assessment of the effects of diabetes duration. Outcomes were considered relevant if the study involved: 1) any measure of fracture risk, 2) any measure of bone structural integrity (such as BMD, trabecular bone score [TBS], and bone material strength index [BMSi]), or 3) bone biochemical markers. Bone markers included osteocalcin (OC), sclerostin, carboxy-terminal collagen crosslinks (CTX), N-terminal propeptide of type 1 procollagen (P1NP), and osteoprotegerin, among others. Measurements of parathyroid hormone (PTH), vitamin D, and alkaline phosphatase (ALP) levels in articles were noted, although articles were not considered for inclusion if no other bone markers were measured. Finally, inaccessible full-text articles were excluded, as the categories of data considered relevant for extraction could not be reliably obtained from abstracts. Conference abstracts were excluded for the same reason. Articles were regarded as inaccessible if there were no links to the articles in the utilized databases; authors were not contacted. Eleven additional articles eligible for inclusion were identified in the reference lists of the examined articles and were included in the final review.
Two authors, RV and ZAM, extracted data from all the included articles; articles involving bone structural parameters were examined by author RV, while articles involving biochemical or fracture-related parameters were examined by author ZAM.
Data related to the following were extracted: 1) author name, 2) study sample size, 3) population characteristics (age, nationality/geographic information, sex, disease status, other relevant information), 4) investigation performed or main outcome parameter (for example, DXA-scan/aBMD), 5) adjustment parameters used in the main statistical analyses, and 6) major findings, including significance levels and effect sizes.
The extracted data for biochemical, structural, and fracture-related outcomes are presented in Table 1, Table 2, and Table 3, respectively. If solely the baseline characteristics from a study population were extracted for review, the study in question was characterized as cross-sectional, regardless of the true nature of the study.
Figure 1 Appraisal/exclusion process.
A total of 125 articles satisfied the inclusion criteria and were included in the present review. Among the included articles, 78 articles investigated bone structural changes associated with T2DM, 61 articles investigated fracture risk, and 28 articles investigated bone biochemical markers.
3.1 T2DM and Biochemical Markers of Bone Health
Among the 28 articles investigating the relationship between T2DM or related parameters and bone biochemical markers (Table 1), 7 articles included only men and 11 included only women as their study subjects. In the remaining 10 articles, the average proportion of women was 55% (not weighted according to study size). In the studies reporting age, the mean ages were averaged (not weighted according to study size) to 58 years.
Only two studies reported no association between T2DM and related parameters (duration, complications, or severity) and bone biochemical markers [22,23]. The most commonly studied markers were OC, sclerostin, CTX, and P1NP. OC and P1NP are markers of osteoblast function and bone formation, while CTX and NTX (N-terminal telopeptide) are collagen degradation products and, therefore, bone resorption markers . Levels of undercarboxylated OC (ucOC) are associated with increased fracture risk . Sclerostin is an inhibitor of osteoblasts and, consequently, bone formation .
Several studies reported lower levels of CTX or NTX in individuals with T2DM [26,27,28,29,30,31,32,33,34], those with diabetes-related retinal complications , or those with increasingly pathological levels of glycemic markers [31,36]. Other studies reported no association between these markers and diabetes [23,36,37,38,39,40]. Zhou et al. reported an increased urinary NTX secretion in individuals with T2DM , whereas Ardawi et al. observed reduced urinary NTX secretion in these individuals .
Several studies reported suppressed OC levels in individuals with T2DM [26,27,29,30,31,32,34,37,38,39,41,42,43,44,45]. Suppressed OC levels have also been reported in association with higher levels of FPG, fasting plasma insulin (FPI), HbA1c, or HOMA-IR (HOMA–insulin resistance) or with lower levels of HOMA-β (HOMA – beta-cell function) [26,31,42,43,44,46,47]. Xia et al. compared different groups of individuals with T2DM and reported decreased OC levels in the group with microalbuminuria; the OC levels were observed to be further decreased in the group with macroalbuminuria .
Yeap et al. reported that the ratio of ucOC to total OC was higher in individuals with T2DM compared to those without DM . Iki et al. observed that this ratio increased with higher levels of FPG, FPI, HOMA-IR, and HbA1c . Few studies reported no association between OC and T2DM [22,23,33]. Bulló et al. reported positive associations of baseline OC levels with FPI, HOMA-IR, and HOMA-β, although changes in OC levels over a period of two years (during a diet-intervention randomized controlled trial) could not predict FPG or FPI levels .
Similarly, P1NP was observed to be reduced in individuals with T2DM [26,27,28,29,30,34,37,39,49], those with diabetes-related retinal complications , and those with higher levels of FPG, FPI, HbA1c, or HOMA-IR or lower levels of HOMA-β [36,49]. Few studies reported no effects of T2DM on P1NP levels [36,38].
Among the six studies investigating sclerostin, two studies reported increased levels of sclerostin in individuals with T2DM [33,34]. In addition, García-Martín et al. reported an association between sclerostin levels and the duration of T2DM . Three studies reported no correlation between T2DM or HbA1c and sclerostin levels [22,38,46]. Only one study reported lower levels of sclerostin in individuals with T2DM or in those with higher levels of FPG or FPI .
Rianon et al. studied the effect of DM duration and reported no association with OC or sclerostin levels . Rasul et al. reported an association between prevalent polyneuropathy and higher levels of CTX, P1NP, and OC in men but not in women . Maagensen et al. and Chailurkit et al. investigated the effect of an oral glucose load and reported that the suppression of CTX was attenuated in individuals with T2DM [37,40]. Moreover, Maagensen et al. observed that the suppression of OC and P1NP was unaffected in individuals with T2DM, and Chailurkit et al. observed the suppression of osteoprotegerin to be unaffected by T2DM [37,40].
Most of the studies investigating levels of vitamin D, PTH, calcitonin, or ALP reported no significant differences between individuals with DM and those without DM [23,26,28,31,32,33,35,36,41,48,50,51]. However, decreased vitamin D levels in individuals with T2DM were reported in three studies [32,36,38], whereas increased levels were reported in one . Four studies observed no effect of DM on vitamin D levels [26,28,31,51]. Three studies reported lower PTH levels in individuals with T2DM [30,31,34,39], whereas in this population PTH levels were reported to be higher in one study  and unaffected in seven studies [23,26,28,32,36,41,51] compared to individuals without DM.
3.2 T2DM and Structural Changes in Bone Tissue
Among the 78 articles that reported outcomes related to bone structure (Table 2), 12 included only men and 30 included only women as their study subjects. In the remaining 36 articles, the average proportion of women was 58% (not weighted according to study size). In the studies reporting age, the mean ages were averaged to 65 years (not weighted according to study size).
There was considerable variation among the articles in regard to the measures of bone structure used, with a variety of measures for BMD, bone composition, and bone microarchitecture.
The most prevalent among the methods and outcome parameters in the examined articles was DXA/aBMD (N = 64), followed by Quantitative Computed Tomography (QCT) or High-Resolution peripheral QCT (HRpQCT) (N = 9), Quantitative UltraSound (QUS) (N = 10), and MRI (N = 3), respectively.
Among the 78 studies involving structural bone measurements, 66 studies reported the effects of T2DM or glycemic control on aBMD, primarily obtained by DXA-scan of total hip, femoral neck, or lumbar spine. In 50 studies, higher aBMD at one or more sites was observed in association with prevalent T2DM or with worse glycemic control in individuals with T2DM. Higher aBMD was observed at all measured sites in 16 studies. Nine studies reported no difference in aBMD, while five studies reported lower aBMD in individuals with T2DM compared to those without T2DM (details below).
A few studies reported no difference in aBMD between individuals with and without T2DM [26,33,52,53,54,55,56,57,58]. Although these study populations were dissimilar in terms of nationalities and sex, all of these studies were adjusted for multiple variables–always including BMI. On the other hand, the studies reporting a difference were more heterogeneous in terms of statistical analyses, and a number of results were based on unadjusted data, although the majority of the studies were adjusted for BMI and other factors (Table 2).
Five studies, four of which included Chinese men and women as study subjects, reported reduced aBMD in correlation with T2DM or higher HbA1c levels [41,48,59,60]. Sert et al., in their study conducted on Turkish men and women, reported that T2DM was associated with reduced aBMD at the lumbar spine in men, whereas higher femoral aBMD was reported in both men and women . The mean BMI values were in the range of 25.1–26.1 in three studies with Chinese subjects [48,59,60], and Zhou et al. reported reduced aBMD only in those subjects which had BMI < 25 kg/m2 . These findings may indicate that T2DM is associated with increased BMD only in the presence of high BMI. However, six other studies conducted on Asian populations did report increased aBMD in subjects with T2DM with mean BMI ranging from 22.0 to 25.6 [30,39,62,63,64,65].
A higher trabecular bone score (TBS) reflects denser trabeculae and a more fracture-resistant microarchitecture . TBS is estimated from DXA and has been reported to be associated with osteoporotic fracture risk, independently of aBMD and clinical risk factors [67,68]. Studies have reported lower TBS in subjects with T2DM compared to those with prediabetes and those with normal glucose metabolism [39,58,69,70]. Especially lumbar spine TBS appears to be reduced in T2DM [58,69,71]. This is consistent with the findings of a meta-analysis conducted by Ho-Pham et al., which concluded that individuals with T2DM exhibit lower TBS compared to those without DM .
Leslie et al. reported an accentuated risk of incident major osteoporotic fracture after adjusting for BMD, whereas the risk was partially attenuated when adjusting for trabecular bone score (TBS) . This supports the conclusion that BMD is insufficient as a prognostic tool for predicting fracture rates in individuals with T2DM. TBS may thus serve as an easily obtainable yet powerful addition to any predictive model for fracture risk in T2DM.
It is not possible to distinguish between trabecular and cortical BMD using DXA. Cortical bone density is a major determinant of bone strength. QCT and HRpQCT enable the assessment of bone architecture at the trabecular and cortical sites using volumetric BMD (vBMD) and the prediction of bone fragility and fracture risk [73,74]. vBMD was measured in nine of the included studies.
Several studies reported vBMD differences, such as higher spine vBMD  and radial and tibial trabecular vBMD [28,76,77] in subjects with T2DM compared to those without DM. A few studies reported higher aBMD in T2DM without observing any difference in vBMD [78,79,80]. One study reported lower vBMD at the spine in individuals with T2DM compared to those without DM . De Waard et al. observed no association between HRpQCT measures of vBMD and T2DM or prediabetes, although they reported an association between HbA1c > 7% (53 mmol/mol) and higher cortical porosity at the distal radius in individuals with T2DM .
Several studies reported higher cortical porosity [77,79] and lower cortical thickness [79,82] and vBMD [76,79] in individuals with T2DM. Nakamura et al. observed higher trabecular vBMD (measured by QUS) in individuals with T2DM after the age of 60 compared to individuals without DM . A few studies reported no difference in cortical thickness (Table 2), while one study reported lower cortical porosity in individuals with T2DM .
A study that employed MRI detected higher bone marrow fat content in T2DM, which correlated inversely to hip aBMD . Another study employing MRI reported increased spacing within the trabecular bone network in subjects with T2DM . A prospective cohort study with two years of follow-up did not report any differences in the evolution of trabecular bone microarchitecture in elderly women with T2DM compared to elderly women without DM .
All the included studies were observational apart from one study, which was a randomized controlled trial . The latter investigated whether bone health could benefit from intensive glycemic control, but no difference in aBMD was observed at any site following intensive or standard glycemic control with a median intervention time at examination of 2.2 years .
In contrast to these findings in individuals with T2DM, a study conducted by Napoli et al. in 2019 examined aBMD in individuals without DM and observed no association with insulin sensitivity assessed through HOMA-IR . This may indicate a dose- and time-dependent effect of insulin resistance on bone quality, which becomes apparent only after the development of T2DM.
In summary, the studies included in the present review were substantially heterogeneous in terms of bone structural outcome measures, sex-distribution, and demographics. Increased aBMD was reported in both men and women with T2DM. Most of the included studies reported a positive association of aBMD with higher glucose or HbA1c levels, whereas a few studies reported a negative association with DM duration even after adjusting for age. However, it is not possible to distinguish between trabecular and cortical bone architecture using aBMD, which is only one component of bone quality. The vBMD measurements in the included studies indicated a greater trabecular bone volume and increased cortical porosity in elderly persons with T2DM. However, there is no clear consensus on which bone site is the most affected by diabetes-related structural changes. Therefore, the elderly with DM may have impaired bone quality which cannot be assessed properly using routine diagnostic methods, i.e. DXA BMD and T-score thresholds.
3.3 Changes in Bone Structure over Time in T2DM
Although there is an apparent association between prevalent T2DM and higher aBMD, a study conducted by Jang et al. reported that subjects with diabetes duration > five years had approximately the same adjusted femoral neck aBMD (0.738 ±0.004 g/cm2) as subjects without T2DM, which was in turn lower than that of subjects with shorter diabetes duration (0.773 ±0.004 g/cm2) after adjusting for age, body mass index (BMI), and other factors . Leslie et al. observed that BMD loss was 0.0018 g/cm2/year greater in individuals with T2DM compared to normal-weight individuals without DM (age-adjusted) . A study conducted by Xu et al. reported a crude odds ratio (OR) of 2.06 for osteoporosis with diabetes duration > 20 years compared to duration < 10 years, although this effect was fully attenuated after adjusting for age, BMI, and a variety of other factors . In addition, Xu et al. reported an adjusted OR of 1.63 for osteoporosis in association with poor glycemic control (HbA1c ≥ 7.5%) in males but not in females .
In contrast, Shan et al. reported a smaller aBMD decrease at the lumbar spine with increasing age in individuals with T2DM compared to those without DM; in addition, a less pronounced increase in osteoporosis prevalence was observed with increasing age .
Taken together, these findings appear to suggest an increase in the rate of bone loss with age. However, it is difficult to reconcile this finding with reduced bone turnover and increased BMD. Rather, it may be that an increased mineral loss is present only in a subset of individuals with T2DM, possibly in those with the highest severity and longest duration of the disease, allowing for several years of mineral accumulation prior to the acceleration of mineral loss at a late stage.
3.4 T2DM and Risk of Fracture
Among the 61 articles investigating the effects of T2DM on fracture risk (Table 3), 6 included only men, and 16 included only women as their study subjects. In the remaining 39 articles, the average proportion of women was 55% (not weighted according to study size). In the studies reporting age, the mean ages were averaged to 70 years (not weighted according to study size).
Most articles (N = 49) reported an increased risk of fracture in at least one location associated with the presence of diabetes or diabetes-related parameters. A total of 13 studies reported no association of fracture risk with T2DM [32,75,89,90,91,92], HbA1c levels [38,62,80,93,94,95,96], fasting plasma glucose [38,62], HOMA indices , or diabetes duration [32,62,80,95]. Five of these studies reported no associations in any of the analyses performed [32,38,75,89,93]. Six studies reported reduced fracture risk in at least one location associated with the presence of diabetes [51,81,95,97,98,99] or higher HbA1c levels ; four of these studies were relatively small (the largest with n = 5,931) case-control studies investigating fracture prevalence [51,81,95,99], whereas the remaining two were retrospective cohort studies investigating fracture incidence [97,98].
All the studies included in the present review were observational apart from one randomized controlled trial which reported no effect of intensive glycemic control on fracture risk compared to standard glycemic control .
Several studies reported an increase in hip fracture prevalence or incidence with the presence of T2DM (N = 22) [14,31,65,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118], higher levels of HbA1c in individuals with T2DM (cut-offs varying among the studies) (N = 6) [91,107,119,120,121,122], higher fasting plasma glucose in individuals with T2DM (N = 1) , complications of diabetes (N = 5) [94,102,107,109,121], or duration of diabetes (N = 8) [14,107,110,114,115,118,120,121]. de Liefde et al. reported no association between T2DM and hip fracture, although they did observe an increased risk of hip fracture associated with diabetes treated with antidiabetic drugs . Among the studies which reported association of T2DM with an increased risk of hip fracture, most presented an OR, a hazard ratio (HR), a relative risk (RR), or an incidence rate ratio (IRR). Most of the effect sizes reported here (OR/HR/RR/IRR) were in the range of 1.30–1.80. The largest studies were conducted by Hothersall et al. (n = 3,840,841) and Hippisley-Cox et al. (n = 3,142,673), which in women reported HRs of 1.05 (95% confidence interval [CI] of 1.01–1.10) and 1.57 (95% CI 1.45–1.69), respectively [110,112]. A meta-analysis of 12 articles (combined n = 764,282), which included several of the studies examined in the present review [31,32,89,113,114,115,118,123], conducted by Dytfeld et al. assessed hip fracture risk and revealed an increased risk with an OR of 1.30 (95% CI 1.07–1.57) . Only one study reported a reduced risk of hip fracture associated with T2DM; however, this association was observed only in the subgroup comprising males not receiving antidiabetic medications .
Vertebral fracture risk was reported to be associated with diabetes in six studies [30,34,62,96,105,125], among which five studies investigated prevalent fractures using x-ray imaging [30,34,62,96,125]. Majumdar et al. studied incident fractures by means of hospital discharge notes and reported an increased risk with a study sample of n = 57,938 . Yamamoto et al. reported a higher prevalence of vertebral fracture (evaluated using x-ray) in women with T2DM, while a lower prevalence was reported in men with T2DM (although no statistical analysis was performed) . Viégas et al. reported an increased prevalence of vertebral fracture associated with longer diabetes duration and with the presence of retinopathy; the increase was not observed for nephropathy and peripheral diabetic neuropathy . Only two of the studies reported ORs [62,96]. Kilpadi et al. reported an OR of 2.86 (95% CI 1.56–5.34), and Yamamoto et al. reported an OR of 1.86 (95% CI 1.11–3.12) for women and 4.73 (95% CI 2.19–10.20) for men; however, both of these studies had a relatively small sample size (n = 296 and n = 996, respectively) [62,96]. In contrast, eight studies reported no association of vertebral fracture risk with diabetes [14,32,75,89,103,111] or glycemic control [38,62]. Among these eight studies, six studies investigated prevalent fractures [32,38,62,75,89,111] and four studies investigated incident fractures [14,32,75,103], most by means of x-ray assessment, although two studies relied on self-reported data [38,111]. A meta-analysis by Dytfeld et al. of seven studies (combined n = 107,514), which included four of the above-stated studies [14,32,62,89], investigated vertebral fracture risk and did not observe this to be increased (OR = 1.13 [95% CI 0.94–1.37]) . No studies reported a reduced risk specifically of vertebral fracture in individuals with T2DM.
Many articles investigated the overall risk of fracture or risk of clusters of fracture types, such as non-vertebral fractures, osteoporotic fractures (OPF), major osteoporotic fractures (MOPF), and non-hip non-vertebral fractures (NHNVF). The majority of these articles reported an increased risk associated with diabetes [14,69,71,80,102,105,108,111,112,113,123,126,127,128,129,130], with glycemia in individuals with T2DM (higher levels of HbA1c or FPG, with cut-offs varying among studies) [69,90,128], with longer disease duration [92,105,123,131], or with diabetic complications [92,102]. Few articles reported no increased risk of overall or clustered fracture types [38,51,81,89,93,95,97,99,103]. In the articles that reported an effect on the overall risk of clustered fracture types, effect sizes (ORs or HRs) were around 1.20 [102,108,112]. Kachroo et al. observed that each 1 standard deviation (SD) increase in HbA1c or FPG levels was associated with an HR of 1.38–1.39 for osteoporotic fractures and an HR of 1.45–1.48 for major osteoporotic fractures .
Reporting of fracture risk in locations other than the hip or vertebrae was less common (data presented in Table 3).
In summary, there appears to be a general trend toward an increased risk of hip and overall fractures in elderly individuals with T2DM compared to individuals without T2DM. This finding is consistent with the conclusion of a literature review conducted by Rasmussen et al. . The severity of DM, measured in terms of glycemic control, diabetes duration, and complications, also appears to be a risk factor for fractures. The evidence for increased risk of vertebral fractures is inconsistent, although all the studies included in the present review reported either no effect or an increased risk of fracture in this location. However, the observed increase in fracture risk may also be mediated, at least in part, by an increased risk of falls due to hypoglycemia and peripheral neuropathy.
3.5 Bone Health and Hypoglycemia
Although hyperglycemia appears to be a risk factor for fractures, some studies reported an increased risk of fractures associated with hypoglycemia or with lower levels of HbA1c compared to higher HbA1c levels [119,125,133,134,135], whereas only two studies reported no deleterious effect of hypoglycemia [120,121]. However, Chiang et al. observed that visit-to-visit variation of FPG was a predictor of hip fracture, indicating an effect mediated by increased hypoglycemia risk . Kachroo et al. quantified the increased risk associated with hypoglycemia and reported an OR of 2.16 (95% CI 1.74–2.67) for any fracture . Viégas et al. observed that normal postprandial glucose in individuals with T2DM was a risk factor for vertebral fractures compared to postprandial hyperglycemia and that women with prevalent fractures had lower levels of postprandial glucose and HbA1c compared to those without prevalent fractures . This may reflect an underlying increased risk of hypoglycemia in those with normal postprandial glucose levels in this particular study population. Two studies reported that the increased fracture risk was entirely or mostly associated with insulin use, suggesting an effect mediated in part by hypoglycemia [124,129]. Another study reported that the increased fracture risk was fully attenuated after adjusting for comorbidities and falls . It is a seemingly inconsistent finding that fracture groups exhibit higher HbA1c levels in some studies and lower HbA1c levels in other studies. However, this apparent contradiction may be explained by a J-shaped association mediated by hypoglycemia and falls at one end and bone fragility at the other. Indeed, Lee et al. reported just such an association with increased fracture risk at both high (> 9.5%) and low (< 6.5%) HbA1c levels .
3.6 Bone Health and Complications of T2DM
A few studies reported data on diabetes-related complications and bone structure. Xia et al. reported that a lower aBMD at the lumbar spine and femoral neck was correlated with albuminuria in individuals with T2DM . Rasul et al. observed no differences in aBMD between individuals having T2DM with and without polyneuropathy . Zhong et al. reported no association between aBMD and HbA1c levels, although it was observed that the presence of microangiopathy was associated with decreased bone mass at the lumbar spine, total hip, and femoral neck in women, while the same was not true for men .
A total of seven studies reported an increased risk of fractures associated with the presence of diabetes-related complications [92,94,102,107,109,121,125]. An increased risk of fractures associated with the presence of peripheral neuropathy was reported in three studies, the largest of which was conducted by Lee et al. (n = 2,798,309) [102,107,121]. Three smaller studies reported no effect of peripheral neuropathy on fracture risk, possibly due to insufficient sample size [62,120,125]. In addition, these three small studies reported no effects of nephropathy  or retinopathy [62,120], whereas four studies (the largest conducted by Kabue et al.; n = 120,256) observed that the presence of retinopathy was associated with fracture risk [92,94,121,125]. Reyes et al. (registry-based study) observed that T2DM with any complications (of unspecified type) presented an increase of 89% in hip fracture risk compared to T2DM without complications, which presented an increase of only 45% in hip fracture risk.
These findings suggest that all complications of diabetes, besides serving as simple proxies for disease severity, may increase fracture risk independently. However, retinopathy and peripheral neuropathy may have a special significance in increasing the risk of fractures, as the impaired vision and proprioception is expected to increase the risk of falling.
3.7 Sex-Specific Differences in Bone Health in T2DM
It is well known that men have a lower risk of osteoporosis and fractures and a higher BMD compared to women . Nonetheless, sex-specific differences regarding bone mass in individuals with T2DM have been investigated inadequately. The vast majority of studies reported increased aBMD associated with T2DM in both men and women (Table 2).
However, a number of studies included in the present review concluded that women with T2DM had a higher aBMD compared to women without DM, whereas no such difference was observed for men [30,88,137,138,139]. A cohort study conducted by Lunt et al. investigated the effect of insulin use in T2DM and reported that insulin treatment was associated with an increase in aBMD at all sites in women, whereas such an increase was observed only at the spine in men .
Only one study reported higher whole-body aBMD in men with T2DM and not in women with T2DM . Chi et al. reported a higher aBMD in men compared to women, independently of the presence of diabetes . Sert et al. observed that the difference in aBMD between subjects with T2DM and those without DM was more pronounced in men than in women . The study reported that among women aged 51–60, those with T2DM exhibited higher femoral neck aBMD than controls . Similarly, among men aged 51–60, those with T2DM exhibited higher femoral neck and total femur aBMD and lower lumbar spine aBMD compared to men without DM, the latter being present already after the age of 30 .
A study comparing men and women with and without T2DM reported that T2DM was associated with skeletal hypertrophy (measured using HRpQCT), which was attenuated at the tibial cortex in men compared to women .
Accounting for sex altered the strength of the association between T2DM and fracture risk in some studies [65,98,111,113], although the direction of this effect was not consistent across studies. Wallander et al. reported that the risks of any fracture, hip fracture, and major osteoporotic fractures were all increased to a higher extent in women compared to men .
3.8 Effects of Other Subject Characteristics
Several articles examined the effects of other participant characteristics on the association between T2DM and fracture risk.
Only two studies investigated the effect of T2DM on fracture risk in individuals with osteoporosis [116,126]. Sato et al. reported an association between T2DM and fracture risk in individuals diagnosed with osteoporosis and receiving antiosteoporotic medication , whereas Taylor et al. reported no association between T2DM and fracture risk in the subset of osteoporotic participants .
Two studies examining bone structure reported that aBMD was increased only in the obese subpopulation  and that obesity attenuated the increased BMD loss over time observed in individuals with long diabetes durations (> 4 years) . In addition, two studies reported that the effect of T2DM on fracture risk was diminished or absent in obese individuals [115,118]. Taken together, these results suggest a protective effect of high BMI, possibly mediated by a beneficial increase in BMD. Alternatively, there may be a protective effect of increased padding of bone tissues in obese individuals.
Nakamura et al. observed that elderly subjects with T2DM and reduced handgrip strength exhibited diminished cortical thickness but no changes in trabecular vBMD . This result indicates that reduced muscle strength, or sarcopenia, is an important factor associated with cortical thinning and, consequently, with increased fracture risk.
The present review provides data on bone health in the elderly with T2DM. However, as most of the studies included were epidemiological in nature, an inevitable uncertainty remains with regard to parameters such as diabetes status and type. Indeed, a few studies attempted to quantify the degree of certainty regarding the type of diabetes present in their subjects. These estimates of certainty appeared to be sufficiently high (≥97%) [87,102]. In case of contamination of the included studies with individuals having T1DM, underestimation of BMD and overestimation of fracture risk are expected . This is supported by the findings reported in two of the included studies, in which comparisons between individuals with T1DM and individuals with T2DM were also performed [53,124]. In the study conducted by Tuominen et al., the individuals with T1DM exhibited lower aBMD values compared to those with T2DM and those without DM . These findings were consistent with those of previous meta-analyses [13,144] and were neither explained by differences in BMI nor by insulin treatment. Wallander et al. reported that fracture risks (any, hip, major osteoporotic, and ankle) were higher in individuals with T1DM compared to any subgroup of individuals with T2DM .
The majority of studies examining OC, P1NP, and CTX/NTX indicated suppression of bone turnover mediated by the presence, severity, and duration of T2DM. This suppression appears to be correlated with the presence and severity of diabetes. Owing to relatively small sample sizes, most of the studies reported unadjusted results and performed few subgroup analyses in general. Therefore, it is not possible to distinguish, for instance, the sex-specific effects. However, there are no clear differences between the results of studies examining one sex and those examining the other or both sexes. The insufficiency of evidence along with varying proxies for disease severity (e.g., comorbidities or glycemic control) do not allow exact conclusions regarding the specific effects of disease severity and comorbidities.
The findings regarding vitamin D and PTH suggest that the levels of vitamin D or PTH might be affected in individuals with T2DM, although the evidence is insufficient, and further research is warranted.
Reduced bone turnover may lead to the accumulation of microfractures and impaired bone quality, resulting in reduced adaptability to alterations in mechanical stress. Furthermore, reduced bone turnover is expected to lead to a relative increase in bone mineral content due to reduced BMD loss over time.
As a consequence of reduced bone turnover, it appears that individuals with T2DM do indeed exhibit a higher aBMD compared to those without DM. Studies on bone microarchitecture suggest compromised bone integrity with more trabecular bone and diminished cortical bone, which correlates highly to bone quality  and may indicate reduced bending strength and axial load-bearing capacity. In addition, some studies reported that T2DM was associated with a greater aBMD loss over time, possibly indicating a subgroup effect, warranting further research.
The difference in aBMD between individuals with T2DM and those without T2DM appeared to be more pronounced in women than in men, although this conclusion must be made with caution due to the considerable heterogeneity of the studies. Overall, no clear demographic variation in the effect of T2DM on bone structure was observed.
These alterations in bone structure reduce bone strength and increase fracture risk, which is observed particularly in the cases of hip and overall fracture risk. The evidence for an increased risk of vertebral fracture presented here is inconsistent and warrants further research. However, a larger proportion of studies examining hip-related regions (total hip, femoral neck, and trochanteric region) reported increases in aBMD compared to studies examining vertebral sites. These differential aBMD alterations between skeletal regions may be related to differences in their respective cortical and trabecular compartments and might affect the site-specific fracture risk. Thus, this may represent a smaller degree of pathology in vertebral bone, which would in turn lead to a less pronounced increase in fracture risk, if any. In addition, there may be a larger effect of under-reporting in vertebral fractures, as many of these fractures do not present with any symptoms and require imaging for verification.
Under-reporting is a general concern in registry studies, where both fracture rates and T2DM prevalence/incidence may be subject to error, in both cases leading to underestimation of associations.
In the present review, no statistical analyses were performed. Therefore, the heterogeneity of the studies could not be quantified, and the overall size and significance of the effects on bone health could not be estimated. Furthermore, owing to the observational nature of almost all the articles included in the present review, causality could not be determined. However, in the cases of all three areas of interest–bone structure, fracture risk, and bone turnover–clear trends were observed indicating the presence of reduced bone turnover along with altered bone distribution and a concurrent increase in fracture risk in elderly individuals with T2DM.
Fracture risk in individuals with T2DM may, however, be influenced by a variety of factors which have not or have only slightly been touched upon in the present review. These factors are discussed in the following.
None of the included articles examined the levels and the effects of advanced glycation end products (AGEs). AGEs are proteins or lipids that have become glycated as a result of exposure to sugars . AGEs are more abundant in tissues in T2DM and have been shown to affect bone biomechanical properties due to cross-linking with bone proteins . This process occurs more freely in low states of bone turnover, as matrix proteins are exposed to the environment for an extended time. In turn, AGEs increase oxidative stress and inflammation, besides negatively affecting bone turnover .
Besides bone fragility, an increased risk of falls would result in a consequent increase in fracture risk. Each year, approximately 30% of individuals aged over 65 years experience a fall , and there is evidence that fall risk is further increased in older adults with T2DM .
Fall risk may in turn be influenced by a variety of risk factors. De Mettelinge et al. reported polypharmacy, poor walking performance, and reduced cognitive function to be mediators of falls in diabetes . Furthermore, characteristics of posture and gait have been demonstrated to be affected in individuals with T2DM and a history of falls .
Gait performance may be affected by disorders affecting proprioception (diabetic sensory neuropathy) [102,107,121], visual acuity (diabetic retinopathy) [92,94,121,125], or muscle strength , each of which has been reported to be associated with fracture risk.
Other significant contributors to falls in the elderly in general–and perhaps in individuals with diabetes in particular–are dizziness, orthostatic hypotension, antihypertensive drug use, and concomitant cardiovascular disease [102,127,156,157].
Finally, fall risk is closely associated with the risk of hypoglycemia, e.g., due to use of insulin and sulfonylureas. Indeed, almost all the included studies reported the highest increase in fracture risk among those treated with insulin, and two studies reported no residual effect when adjusting for insulin use [124,129].
However, it is difficult to elucidate the full nature of these associations, as polypharmacy and use of insulin represent more severe cases of T2DM with longer diabetes duration and a higher comorbid load, allowing an increased impact on bone turnover and quality.
In relation to all the topics reviewed, conflicting results have been reported. This may be due to a variety of factors, including limited sample sizes and the considerable amount of both known and unknown possible confounders. Certain subject characteristics are fundamentally linked; therefore, the effects of individual characteristics are difficult to account for. This may be the case for glucose-lowering drugs and therapies for comorbidities (and the duration of treatment), which may exert direct effects on bone biochemical and biomechanical properties and also be inherently linked to the severity and duration of T2DM along with the presence of complications and, for certain drugs, hypoglycemic episodes. Other relevant confounders that were not investigated are low-grade inflammation and, in the case of NTX, renal function.
In conclusion, health problems in the elderly, particularly those with T2DM, are numerous, and the elevated risk of fractures results in increased morbidity and mortality. The increased fracture risk may present an even bigger challenge in individuals with T2DM, as Tebé et al. reported that mortality following hip fracture was higher in the elderly with T2DM compared to those without DM . In this context, considering that common prediction tools underestimate fracture risk in diabetes , the development of more sensitive diagnostic tools for evaluating bone health in the elderly with T2DM is essential.
The use of newer bone imaging techniques, such as HRpQCT, is limited to the research setting and awaiting studies to demonstrate their clinical utility, while the use of TBS appears to be a more validated and easily accessible method for the evaluation of bone quality.
Further research exploring underlying mechanisms for diabetes-related effects on bones is required. In particular, more intervention trials are required to establish causality and determine reversibility of the effects on bone biochemical and biomechanical properties.
The following additional materials are uploaded at the page of this paper.
1. Table S1: Schematization of search terms used for PubMed.
2. Table S2: Search strings used for the respective databases.
Authors ZAM and RV performed literature search, the article appraisal process and all data extraction. ZAM and RV devised the first draft of the manuscript. All additional authors reviewed all subsequent versions of the manuscript and provided detailed feedback for, and identified additional articles for inclusion.
The authors have received funding for this work by the Novo Nordisk Foundation (Steno Collaborative Grant no. NNF18OC0052064).
The authors have declared that no competing interests exist.
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