Patient Reported Outcome Scores Following Traumatic Hip Dislocations

Objective: Traumatic native hip dislocations require immediate orthopaedic attention and have been associated with significant long-term morbidity. Previous studies have reported radiographic outcomes and clinical complication rates, however; evidence evaluating the effect of these injuries on patient-reported outcomes (PROs) is limited. The purpose of our study was to evaluate PRO scores among patients with native hip dislocations.

Methods: Adult patients with native hip dislocations between 2005 and 2020 at a single academic Level 1 trauma center were retrospectively reviewed. Radiographs and medical records were reviewed for patient demographics and comorbidities, injury characteristics, details of treatment including time to reduction, and complications. Patients were given the PROMIS Physical Function (PROMIS PF) and Short Form-36 (SF-36) via HIPAA compliant electronic data capture. Outcomes were analyzed using Student t-tests and Mann-Whitney U comparisons of means/medians. Floor and ceiling effects were also characterized for the various outcomes scores.

Results: A total of 168 patients with native hip dislocation were identified, 78 (46.4 %) of whom completed all PROs measures. Among responders, mean age was 36.2 years (SD 14.5), mean BMI was 29.2 (SD 6.7), and mean dislocation duration was 8.9 h (SD 5.1). On univariable regression, older age was associated with worse SF-36 Physical scores (p = 0.007). PROMIS PF showed an estimated 2.18 decrease for every one grade increase in Kellgren-Lawrence score (p = 0.01). There were no ceiling or floor effects seen with PROMIS PF, SF-36 Physical Summary, or SF-36 Mental Summary Scores.

Conclusions: Patients of older age and higher Kellgren-Lawrence score exhibited worse SF-36 Physical Function and PROMIS PF scores, respectively, highlighting the functional impact that native hip dislocations may have. PROMIS PF, SF-36 Physical and Mental Summary Scores were without floor or ceiling effects, rendering this an important tool in the evaluation of patients with traumatic native hip dislocation.