EP7.6 Changes in Spinopelvic Alignment After Hip Arthroscopic Surgery

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ID: 331107
2026
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Abstract
Abstract Background Spinopelvic alignment influences clinical outcomes after hip arthroscopy; however, postoperative changes in these parameters have not been well characterized. Purpose To investigate changes in spinopelvic alignment following hip arthroscopy. Methods Patients who underwent hip arthroscopy for labral tears between June 2025 and January 2026 were retrospectively reviewed. Patients with osteoarthritis, developmental dysplasia of the hip (LCEA < 20°), or prior spinal surgery were excluded. Demographic data were collected. Preoperative and 3-month postoperative lateral pelvic radiographs in standing and sitting positions were analyzed. Sacral slope (SS) and pelvic tilt (PT) were measured, and standing-to-sitting changes (posterior pelvic tilt) were calculated. Paired t-tests were used for comparisons. Results Twelve hips (7 male, 5 female) with a mean age of 45.7 years and mean BMI of 23.5 were included. Five hips had femoroacetabular impingement and five had borderline developmental dysplasia. Mean LCEA was 27 ± 4.7°, and alpha angle was 67.7 ± 5°. Standing PT significantly decreased from 15.1 ± 6° preoperatively to 13.5 ± 6.3° postoperatively (P = 0.0175), indicating an anterior pelvic shift. Standing SS increased from 29 ± 5.9° to 31.5 ± 8.2° (P = 0.111). Sitting SS and PT showed similar trends toward anterior tilt (SS: 16.4 ± 9.7° to 19.5 ± 8.6°, P = 0.236; PT: 29.7 ± 8° to 28.7 ± 8.9°, P = 0.742). The standing-to-sitting posterior pelvic tilt did not differ significantly between pre- and postoperative measurements (SS: 12.7 ± 9° vs 12.1 ± 12.6°, P = 0.854; PT: 14.6 ± 9.4° vs 15.2 ± 9.0°, P = 0.813). Conclusion Hip arthroscopy may result in a slight anterior shift in pelvic alignment, possibly reflecting reduced pain-related compensatory posterior tilt.
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Authors Yohei Matsuhsita, Hajime Sugiyama, Mitsuru Saito
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.369
URL
https://doi.org/10.1093/jhps/hnag043.369
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