EP1.20 Changes in Hip Range of Motion Following Periacetabular Osteotomy: A Single-Surgeon Case Series

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ID: 331022
2026
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Abstract
Abstract Periacetabular osteotomy (PAO) is the gold-standard procedure for symptomatic pre-arthritic acetabular dysplasia; however, its effect on postoperative hip range of motion (ROM) remains incompletely defined. While radiographic correction and pain improvement are well established, short-term clinical ROM data in a generalizable cohort remain limited. The purpose of this study was to evaluate changes in passive hip ROM following PAO through short-term follow-up. A retrospective single-center case series was performed on 148 hips in 148 patients undergoing PAO between July 2017 and December 2024. Patients were followed at 6 months postoperatively and again at a final follow-up time point (mean 18.1 ± 13.8 months). Passive ROM was measured by a single fellowship-trained hip preservation surgeon. Assessed variables included external rotation (ER), internal rotation (IR), flexion, flexion external rotation (FER), and flexion internal rotation (FIR). All five parameters were recorded preoperatively, intraoperatively, at 6 months, and at final follow-up, while flexion, FER, and FIR were additionally measured intraoperatively immediately following fixation. Mean ER increased from 45.2 ± 12.9° preoperatively to 47.4 ± 10.3° at 6 months and 48.8 ± 11.3° at final follow-up (p = 0.004). Flexion similarly increased from 99.5 ± 9.7° to 102.4 ± 9.5° at final follow-up (p < 0.001). FER remained stable across all time points (p = 0.444). IR decreased from 48.0 ± 15.7° preoperatively to 42.7 ± 13.6° at 6 months and 44.5 ± 12.6° at final follow-up (p < 0.001). FIR decreased from 34.2 ± 13.6° preoperatively to 26.3 ± 6.6° intraoperatively, 28.7 ± 9.5° at 6 months, and 28.0 ± 9.1° at final follow-up (p < 0.001). PAO mildly increased ER and flexion and reduced IR and FIR. Although statistically significant, these changes are modest and likely of limited clinical relevance for most athletic activities. These findings may improve preoperative counseling and postoperative expectation setting in athletic patients undergoing hip preservation surgery.
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Authors Christopher Currie, Ty Monty, Joel Williams
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.204
URL
https://doi.org/10.1093/jhps/hnag043.204
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