Scientific Publications Database
Article Title: Bone density changes following surgical correction of femoroacetabular impingement deformitiesAuthors: Speirs, A. D.; Rakhra, K. S.; Weiss, M. -J. Weir; Beaule, P. E.
Journal: OSTEOARTHRITIS AND CARTILAGE Volume 26 Issue 12
Date of Publication:2018
Abstract:
Objective: Femoroacetabular impingement (FAI) involves abnormal hip biomechanics due to deformities and is associated with osteoarthritis. Bone mineral density (BMD) in the acetabulum is higher in subjects with convex femoral (cam) FAI deformities compared to control subjects. The objective of this study was to assess post-operative changes of BMD with and without surgical correction of the cam deformity.Design: Thirteen patients with bilateral cam deformities but unilateral symptoms underwent preoperative and follow-up computed tomography (CT) scans of both hips. The deformity was surgically removed from the symptomatic hip. BMD was measured in regions of interest (ROI) around the superior acetabulum from CT scans at both time points. The contralateral untreated hip was used as a withinpatient control. Changes in BMD were assessed by two-way repeated measures ANOVA (side, time) and paired t-tests.Results: A greater BMD decrease was seen in the treated compared to the untreated hip (P < 0.0018). BMD within the superior acetabulum decreased by 39 mg/cc on the treated side (P < 0.0001) but only 9 mg/cc (P = 0.15) in the untreated contralateral hip. These changes represent 7.1% and 1.7% of the preoperative BMD on the respective sides.Conclusions: BMD decreased in the treated hip, suggesting a positive effect of surgical correction in relieving stresses within the hip joint. Longer term follow-up is required to assess the ultimate fate of the articular cartilage within the joint. This study showed that surgical correction of the cam deformity in patients with FAI may alter the pathological biomechanics within the joint. (c) 2018 Osteoarthritis Research Society International. Published by Elsevier Ltd. All rights reserved.