Abstract
PurposeThe efficacy of osteoporosis medication on reducing the risk of non-trauma fracture (NTFx) among adults with cerebral palsy (CP) has not been comprehensively investigated. There are many logistical and biological factors that may reduce this efficacy, and therefore requires attention. The purpose of this propensity score-matched, observational cohort study was to determine if osteoporosis medication was associated with NTFx risk attenuation among adults with CP and compared to adults without CP.Materials and MethodsData from 07/01/2011 to 09/30/2015 were extracted from Optum Clinformatics® Data Mart. Claims identified adults (≥18 years), CP, osteoporosis medication, pre-index NTFx (6-months), and post-index NTFx (12-months). CP without osteoporosis medication (CPMeds-) and without CP with Meds (non-CPMeds+; reflects “background” population) served as controls and were matched (6:1 ratio) to adults with CP with Meds (CPMeds+; n=306). The Meds groups were further stratified by the initiation of their medication as new users or consistent users. Changes in the prevalence of NTFx from pre- to post-index periods were examined with risk ratios (RR) and the change was compared among groups using the ratio of the RR (RRR) via difference-in-difference analysis.ResultsNew users with CP had: a larger risk attenuation of any NTFx compared to CPMeds- (RRR=0.39; 95% CI=0.22–0.71), which was consistent for vertebral column/hip and lower extremities; a larger risk attenuation for NTFx of the lower extremities compared to consistent users with CP (RRR=0.22; 95% CI=0.05–0.93); and a similar risk attenuation of any NTFx compared to new users without CP (RRR=0.81; 95% CI=0.45–1.43), which was consistent for vertebral column/hip and lower extremities.ConclusionThe findings suggest that osteoporosis medication is associated with clinically meaningful risk attenuation of NTFx, especially for new users with CP.
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