Pediatric Patients Undergoing Total Hip Arthroplasty: A Single Center Experience at Average 5.3 Year Follow-Up.

Abstract

Background: Total hip arthroplasty (THA) is an increasingly popular option for pediatric end-stage hip disease. However, data regarding implant longevity and functional outcomes remain limited. This case series evaluated complication and revision rates, patient-reported outcome measures (PROMs), and implant survivorship in consecutive pediatric THA patients from a single surgeon. We hypothesized that pediatric patients would have low revision rates and excellent functional outcomes at five-year follow-up.

Methods: Following institutional review board approval, 74 patients under age 21 who underwent 92 THAs between 2013 and 2023 were identified. Age, etiology, follow-up interval, complications, revisions, and pre- and postoperative PROMs were recorded. The mean follow-up was 5.3 years (range, one to 11.2) and mean age at surgery was 16 years (range, 11 to 21). All patients underwent THA by the senior surgeon through a posterior (92.4%) or anterior (7.6%) approach; 90.2% received a ceramic on a highly cross-linked polyethylene bearing, with the remaining 9.8% receiving a metal femoral head. All patients received a cementless stem based on femoral morphology. No patients were lost to follow-up.

Results: The most common etiologies were Perthes disease and corticosteroid-induced osteonecrosis (15.2% each). A patient (1.1%) with Mucopolysaccharidosis type IV required a femoral revision for aseptic loosening; no other patients were revised. All average postoperative PROMs improved significantly (P < 0.00001): Hip Disability and Osteoarthritis Outcome Score, Joint Replacement (HOOS-JR) 53.4 (interquartile range [IQR], 46.7 to 70.4) to 89.9 (IQR, 85.3 to 100), EQ-5D 0.5 (IQR, 0.2 to 0.7) to 0.8 (IQR, 0.7 to 1), and EQ visual analog scale (EQ-VAS) 81 (IQR, 70 to 95) to 85 (IQR, 80 to 100). Revision-free Kaplan-Meier survivorship at five and 10 years was 98.9%.

Conclusion: Total hip arthroplasty in patients under age 21 yields substantial improvements in five-year functional outcomes, regardless of etiology, with extremely low revision rates and excellent implant survivorship.