Dose-Dependent Association Between Sarcopenia and Moderate-to-Severe Thoracic Vertebral Fragility Fracture in Older Adults

IntroductionSarcopenia and vertebral fracture affect a large number of older adults and can be debilitating. However, the correlation between sarcopenia and vertebral fracture has not been well studied. Thus, this study investigates the correlation between vertebral fragility fracture and the severity of sarcopenia.MethodThis cross-sectional study included 300 community-dwelling older adults with risk higher than 10-year probability of 3% for a hip fracture and 20% for a major osteoporotic fracture by FRAX score. Sarcopenia was defined according to the Asian Working Group for Sarcopenia consensus. Bone mineral density (BMD) was classified into normal or abnormal groups (T-score <= -1.0) according to WHO criteria. Vertebral fracture was graded mild, moderate, and severe by standardized semi-quantitative method. The association between sarcopenia and vertebral fragility fracture was investigated using a logistic regression model adjusted for confounding factors.ResultsCompared with the normal BMD group, the abnormal BMD group had a significantly higher prevalence of sarcopenia (7.4% vs. 26.6%, p <0.001), poorer muscle mass (p < 0.001) and hand grip (p < 0.001). The prevalence of moderate-to-severe fracture was significantly different (p = 0.006) among severe sarcopenia (16,7%), sarcopenia (6.9%), and non-sarcopenia (3.7%) for thoracic vertebrae. In the logistical regression model adjusted for confounding factors, sarcopenia plus severe sarcopenia was identified as a risk factor of moderate-to-severe thoracic vertebral fragility fracture (odds ratio(OR) = 3.29, 95% CI 1.23-8.78, p = 0.018). We further classified the participants into normal, sarcopenia, and severe sarcopenia and found that sarcopenia and severe sarcopenia had a dose-dependent association with prevalence of thoracic vertebral fragility fractures with OR of 2.56 (95% CI: 0.66-9.91) and 4.04 (95% CI: 1.24-13.20), respectively; P for trend = 0.014. ConclusionSarcopenia is a potential risk factor for, and has a dose-dependent association with, moderate-to-severe thoracic fragility fracture in older adults at increased risk for fractures.