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Abstract
Objective To examine the association between fractures and Parkinson disease (PD) during the 5-year prodromal phase as compared to controls.
Methods We performed a population-based case–control study of Medicare beneficiaries in the United States from 2004 to 2009. We identified 89,632 incident PD cases and 117,760 comparable controls 66–90 years of age in 2009. PD case status was the outcome, and noncranial fracture the independent variable. We used logistic regression models to estimate odds ratios (ORs) and 95% confidence intervals (CIs) for association between fracture and PD in yearly time intervals prior to PD diagnosis/control reference date, after adjusting for covariates.
Results There were 39,606 total fractures (25.4% cases, 14.3% controls) over the 5 years prior to the PD diagnosis/control reference date. PD was positively associated with fractures even after adjusting for age, sex, race/ethnicity, Charlson comorbidity index, alcohol use, tobacco use, and osteoporosis. The association between PD and fracture was evident at yearly time windows prior to PD diagnosis/control reference date. The association between PD and each type of fracture strengthened as the PD diagnosis/control reference date approached (all time interaction p values ≤0.02). Among beneficiaries with a mechanism of injury, the majority were attributed to falls (74.6% cases, 72.8% controls).
Conclusion Fractures occur more commonly during the prodromal period of PD compared to controls, especially as diagnosis date approached, suggesting that patients with PD may experience unrecognized motor and nonmotor symptoms.
Glossary
- CI=
- confidence interval;
- ICD-9-CM=
- International Classification of Diseases, 9th revision, Clinical Modification;
- OR=
- odds ratio;
- PD=
- Parkinson disease;
- RBD=
- REM sleep behavior disorder;
- TBI=
- traumatic brain injury
Footnotes
Go to Neurology.org/N for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.
CME Course: NPub.org/cmelist
- Received July 6, 2019.
- Accepted in final form December 2, 2019.
- © 2020 American Academy of Neurology
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