Radiographic Predictors of Hip Pain in Femoroacetabular Impingement


Anil S. Ranawat, MD

Assistant Professor of Orthopaedic Surgery, Weill Cornell Medical College
Assistant Attending Orthopaedic Surgeon, NewYork-Presbyterian Hospital
Assistant Attending Orthopaedic Surgeon, Hospital for Special Surgery

Ben Schulz, MD
Orthopedic, Schulthess Klinik


Sebastian F. Baumbach, MD
Orthopedic, Schulthess Klinik


Morteza Meftah, MD
Hospital for Special Surgery


Reinhold Ganz, MD
Orthopedic, Schulthess Klinik


Michael Leunig, MD
Joint Center Lower Exremities, Schulthess Klinik

Abstract

The primary diagnosis of femoroacetabular impingement is based on clinical symptoms, physical exam findings, and radiographic abnormalities. The study objective was to determine the radiographic findings that correlate with and are predictive of hip pain in femoroacetabular impingement (FAI). One hundred prospective patients with unilateral FAI symptoms based on clinical and radiographic findings were included in this study. All patients filled out a WOMAC pain questionnaire. Two independent-blinded surgeons assessed antero-posterior and lateral radiographs for 33 radiographic parameters of FAI. Correlations between pain scores and radiographic findings were calculated. A matched radiographic analysis was performed comparing symptomatic versus asymptomatic hips. Radiograph findings were also compared between males and females. Weak positive correlations were identified between increasing pain scores with radiographic findings of posterior wall dysplasia, presence of a shallow socket, and a more lateral acetabular fossa relative to the Ilioischial line. A symptomatic hip had a lower neck shaft angle, greater distance from Ilioischial line to acetabular fossa and larger distance from cross-over sign to superolateral point of the acetabulum when compared to the asymptomatic hip in the same patient. Symptomatic hips in males had more joint space narrowing, femoral osteophytes, higher alpha angles and larger, more incongruent femoral heads compared to females. Females had more medial acetabular fossa relative to the Ilioischial line and smaller femoral head extrusion index. Similar to other musculoskeletal conditions, radiographic findings of FAI are poor predictors of hip pain.

This article appears in HSS Journal: Volume 7, Number 2.
View the full article at springerlink.com.

About the HSS Journal
HSS Journal, an academic peer-reviewed journal, is published twice a year, February and September, and features articles by internal faculty and HSS alumni that present current research and clinical work in the field of musculoskeletal medicine performed at HSS, including research articles, surgical procedures, and case reports.


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