ePoster #200 - ISHA Annual Scientific Meeting 2016

Prevalence of Chondral Defects on the Femoral Head and Acetabulum in Patients with Borderline Dysplasia Compared to Non-Dysplastic Patients Who Underwent to Hip Arthroscopy for FAI Treatment

Renato Locks, MD, Vail, CO UNITED STATES
Karen K. Briggs, MPH, Vail, CO UNITED STATES
Ioanna Bolia, MD, Vail, CO UNITED STATES
Jorge Chahla, MD, Vail, CO UNITED STATES
Hajime Utsonomyia, PhD, Vail, Colorado UNITED STATES
Marc J. Philippon, MD, Vail, CO UNITED STATES

Steadman Philippon Research Institute, Vail, Colorado, UNITED STATES

FDA Status Not Applicable

Summary: Patients with femoroacetabular impingement and borderline dysplasia have a higher likelihood to have Grade III and IV chondral damage on the femoral head than patients with a non-dysplastic hip.

Abstract:
Background: Borderline dysplasia is characterized by a lateral center edge angle (LCEA) between 20º-25º in the anteroposterior(AP) pelvic radiograph. Borderline dysplastic patients undergoing hip arthroscopy to address femoroacetabular impingement (FAI), often present cartilage lesions on the femoral head and/or the acetabulum. Hypothesis/Purpose: To compare the prevalence of cartilage lesions (Outerbridge grades III and IV) on the femoral head and acetabulum surface between borderline dysplastic and normal subjects who underwent primary hip arthroscopy to address femoroacetabular impingement pathology. Methods: Patients who underwent primary hip arthroscopy with correction of FAI (labral repair or labral reconstruction) from November 2005 to April 2016 were included. Patients were divided into two groups based on their LCEA measurement on the AP pelvic radiograph. Borderline dysplastic patients (Group 1) had LCEA measurements between 20º -25º. Non-dysplastic patients (Group 2) patients had LCEA measurements between 25º-40º, The prevalence and the size of chondral lesions on the femoral head and acetabulum were recorded for both groups during hip arthroscopy. This was a retrospective comparative study of prospectively collected data. Results: Two thousand five hundred and forty six patients met the inclusion criteria and were included in this study. Group 1 (borderline dysplastic) consisted of 324 patients with an average LCEA of 23.2º. In the second group, 2222 patients were included with an average LCEA of 34.6º. Borderline dysplastic patients were eight times more likely to have grade III and IV chondral defects on the femoral head surface compared to the non-dysplastic group (p<0,001). On the acetabular side, no difference in the prevalence was found between the two groups. (p=0.588). Regarding the chondral damage size, the borderline dysplastic group had significantly larger damage than the non dysplastic group in the acetabulum and the femoral head (p=0.039 and p=0.011, respectively). Conclusion: Patients with FAI and borderline dysplasia are more likely to have grade III and IV Outerbridge chondral damage only in the femoral head than non-dysplastic patients. Borderline dysplastic patients had significantly larger chondral damage in the femoral head and acetabulum.