Exploring the Relationship between Cerebral Palsy and Hip Dysplasia: Insights from the National Inpatient Sample

<i>Background and Objective</i>: Cerebral palsy (CP) significantly impacts quality of life globally. Hip dysplasia (HD) is a common musculoskeletal issue in CP patients. This study investigates the prevalence, risk factors, and impact of HD on CP patients using a large national database. <i>Materials and Methods</i>: Data from the National Inpatient Sample (NIS) database (2016-2019) were used, identifying CP and HD diagnoses through ICD-10 codes. Baseline characteristics were tabulated. Univariate and multivariate logistic regression analyses examined predictors of HD development in CP patients, presenting data as odds ratios (ORs) with 95% confidence intervals (CIs). <i>Results</i>: Among 3,951,040 pediatric patients, 28,880 had CP (27,466 without HD, and 1414 with HD), and 3,922,160 did not have CP. CP significantly increased the likelihood of developing HD in univariate (OR = 35.03, 95% CI [33.01, 37.17], <i>p</i> < 0.0001) and multivariate (OR = 26.61, 95% CI [24.94, 28.40], <i>p</i> < 0.0001) analyses. Among patients with CP, race was significantly associated with HD, with ORs below 1 for all racial categories compared to Whites. Females had nearly twice the odds of HD compared to males (OR = 1.96, 95% CI [1.86, 2.05], <i>p</i> < 0.0001). Age was significantly associated with HD, with each additional year increasing the odds (OR = 1.03, 95% CI [1.026, 1.034], <i>p</i> < 0.0001). Individuals in the high 51st-75th income quartile had a 17% increase in the odds of HD (OR = 1.17, 95% CI [1.09, 1.25], <i>p</i> < 0.0001) compared to the low 1st-25th income quartile. <i>Conclusions</i>: This study reinforces the strong association between CP and HD, highlighting the need for further research and prospective studies to validate these findings.