Radiographic evaluation of osteoarthritis of the hip

Abstract

Background and purpose Different methods have been used to classify osteoarthritis (OA) of the hip. We evaluated the reliability of different classifications in order to find which grading system is most appropriate for use in clinical practice.Patients and methods 49 patients (61 affected hips) with late-detected developmental dislocation of the hip (DDH) were studied. The mean age at follow-up was 45 (32–49) years. 3 classifications of OA were compared. The gradings by Kellgren and Lawrence (1957) (K&L) and are global visual assessments based on osteophytes, cysts, subchondral sclerosis, and narrowing of the joint space. The third classification is based on narrowing in the upper, weight-bearing part of the joint and defines as OA a minimum joint space width (JSW) of less than 2.0 mm at the narrowest part. 2 experienced observers, one radiologist and one orthopedic surgeon, assessed and measured the radiographs.Results Minimum JSW (Interpretation Joint space narrowing using a minimum JSW of