EP9.17 Patients with Cam- And Pincer-Type Hip Impingement Demonstrate Similar Magnitude of Peak Pelvic Drop

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ID: 331404
2026
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Abstract
Abstract Purpose Femoroacetabular impingement syndrome (FAIS) is a common cause of groin pain in young adults. Classically, cam-and pincer-type FAI are based on static radiographic images, but FAIS is a dynamic pathology that may be affected by pelvic dynamics during activity. It was hypothesized that cam- and pincer-type FAIS would demonstrate altered peak pelvic drop in the coronal plane. Methods Motion-capture, demographic, and patient-reported outcome measurements (PROMs) data were analyzed for all patients with unilateral FAIS from a prospectively collected hip arthroscopy database. Motion capture during walking was performed using inertial measurement units (Movella, Xsens, El Segundo, CA, USA), and the peak pelvic drop of both hips was assessed. The following PROMs were analyzed: International Hip Outcome Tool (iHOT-12), Hip Outcome Score–Sports Subscale (HOS-SS), Patient Reported Outcomes Measurement (PROMIS) Physical Function, PROMIS Pain Interference, PROMIS Depression, and PROMIS Anxiety. Pelvic kinematics and PROMs were compared between cam- and pincer-type FAIS using an unpaired Student's t-test. In addition, coronal peak pelvic motion during walking was correlated to lateral center-edge angle (LCEA) and alpha angle using Spearman`s rank coefficient test. Radiographic definitions used were cam, Alpha angle ≥55° and pincer-type, LCEA ≥40°. Results In total 83 hips in 83 patients were included with 38 hips of cam-type and 45 pincer-type FAIS. During walking, peak pelvic drop was 5.0° ± 1.4 on the symptomatic hip and 4.8° ± 1.6 on the asymptomatic hip for cam-type FAIS which was similar to peak pelvic drop in patients with pincer-typer FAIS (symptomatic: 4.5° ± 1.6 and 5.1° ± 2.0 for pincer-type FAIS, respectively (p > 0.05). Preoperative PROMs were also similar between cam- and pincer-type FAIS patients (p > 0.05). In addition, preoperatively, LCEA and alpha angle did not show a significant correlation to peak ipsilateral and contralateral pelvic drop (p>0.05). Discussion Peak pelvic drop did not differ between patients with cam- versus pincer-type FAIS and did not show a significant correlation to preoperative LCEA or alpha angle. Further studies are warranted to analyze the impact of peak pelvic drop on postoperative recovery and outcomes in patients undergoing hip arthroscopy surgery.
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Authors Mr Nicholas Lee, Mr Lucas Kim, Nils Becker, Gregory R. Roytman, Mr John Slevin, Renato Locks, Aidin Eslam Pour, Andrew Jimenez
Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.497
URL
https://doi.org/10.1093/jhps/hnag043.497
Keywords Keywords not found

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