Ga Eun Nam

Background Whether bone mineral density (BMD) is related to the risk of Parkinson's disease (PD) is unclear. Objectives The objective of this study was to examine the association between BMD status and incident PD in postmenopausal women. Methods We retrospectively examined a nationwide cohort of 272,604 women aged 66 years who participated in the 2009–2012 Korean national health screening for transitional ages. BMD was evaluated using dual‐energy X‐ray absorptiometry of the central bones. The use of antiosteoporosis medications (AOMs) was assessed. We performed multivariable Cox proportional hazards regression to evaluate the association between BMD and PD risk by calculating hazard ratios (HRs) and 95% confidence intervals (CIs). Results During the median follow‐up of 7.7 years, 2,884 (1.1%) incident PD cases developed. After adjusting for confounding factors, lower BMD was associated with an increased risk of PD ( P for trend <0.001). Individuals with osteoporosis had a 1.40‐fold higher HR (1.40, 95% CI: 1.25–1.56) than those with a normal BMD. Sensitivity analyses suggested the associations robust to longer lag periods and further adjustment. These associations were prominent in individuals without AOM use before or after enrollment ( P for interaction = 0.031 and 0.014). Increased risks of PD in individuals with osteopenia and osteoporosis who did not use AOMs were attenuated by the medication use during the follow‐up period, regardless of previous AOM use. Conclusions Lower postmenopausal BMD and osteoporosis were associated with an increased risk of PD. In addition, this association could be mitigated using AOMs. Proper management of BMD in postmenopausal women may help prevent PD. © 2023 International Parkinson and Movement Disorder Society.