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JOURNAL OF ORTHOPAEDIC SCIENCE, vol.23, no.1, pp.117-121, 2018 (SCI-Expanded)
Background: The main purposes of the present study were to evaluate the functional improvement, to identify the predictors of the clinical outcome after open surgical management of femoroacetabular impingement (FAI) in mid-term, and to determine 5-year survival rate. Methods: In this retrospective study, the clinical data of 33 patients (34 hips) were evaluated. Sex, age, body mass index (BMI), type of FAI, duration of symptoms up to surgical treatment, internal rotation of the affected hip, improvement of the Harris hip score (HHS) in the first 2 years, joint space narrowing evaluated radiographically and classified according to KellgreneLawrence classification, and any labral tear were the independent variables. Harris hip score and degenerative arthritic changes at the latest follow-up were identified as outcome measures. Univariate and multivariate analyses were performed. The mean post-operative follow-up was 6 years. Results: Harris hip scores at the latest follow-up were significantly worse in patients with a pre-operative age >35 years, BMI >= 25 kg/m(2), internal rotation of the hip <= 10 degrees, grade 1 or 2 joint space narrowing, labral tear, and <15 points improvement of the HHS at the first 2 years follow-up. According to multivariate analysis; major predictors of the outcome were BMI, labral tear, and improvement of the HHS at the first 2 years. Conclusions: A pre-operative BMI >= 25 kg/m(2), labral tear, and < 20 points improvement of the HHS in the first 2 years of surgery should be considered as the major predictors of the clinical outcome after open surgical management of idiopathic FAI. (C) 2017 Published by Elsevier B.V. on behalf of The Japanese Orthopaedic Association.