FUNCTIONAL OUTCOMES OF PELVIC OSTEOTOMIES FOR HIP DYSPLASIA: A STUDY USING THE UK NON-ARTHROPLASTY HIP REGISTRY (NAHR) DATASET

Pelvic re-orientation osteotomy is a well-recognised treatment of young adults with developmental dysplasia of the hip (DDH). The most commonly used technique is the periacetabular osteotomy (PAO), however, some surgeons favour a triple osteotomy. These techniques can also be utilised for acetabular retroversion leading to FAI. Despite the published literature on these techniques, the authors note a scarcity of evidence looking at patient reported outcome measures (PROMs) for these procedures. This was a retrospective analysis of prospectively collected data utilising the UK NAHR. All patients who underwent pelvic osteotomy from January 2012 to November 2019 were identified from the NAHR database. Patients who consented to data collection received EQ-5D index and iHOT-12 questionnaires, with scores being collected pre-operatively and at 6, 12 and 24 months post-operatively. Nine hundred and eleven (911) patients were identified with twenty-seven (27) undergoing a triple osteotomy, the remaining patients underwent PAO. Mean age was 30.6 (15–56) years and 90% of patients were female. Seventy-nine (79) (8.7%) of patients had the procedure for acetabular retroversion leading to FAI Statistical analysis, of all patients, showed significant improvement (p<0.001) for; iHOT-12 scores (+28 at 6-months, +33.8 at 12-months and +29.9 at 24-months) Similarly there was significant improvement (p<0.001) in EQ-5D index (+0.172 at 6-months, +0.187 at 12-months and +0.166 at 24-months) Pre-operatively, and at each follow-up time-period, raw scores were significantly better in the DDH group compared to the FAI group (p<0.05); however, the improvement in scores was similar for both groups. For both scoring measures, univariable and multivariable linear regression showed poorer pre-operative scores to be strongly significant predictors of greater post-operative improvement at 6 and 12 months (p