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Rheumatology 2000; 39: 612-619
© 2000 British Society for Rheumatology

End-stage coxarthrosis and gonarthrosis. Aetiology, clinical patterns and radiological features of idiopathic osteoarthritis

J. Chitnavis, J. S. Sinsheimer1, M. A. Suchard1, K. Clipsham and A. J. Carr

Nuffield Orthopaedic Centre, Headington, Oxford OX3 7LD, UK and
1 University of California, Los Angeles, CA, USA

Objectives. To determine and compare the aetiological background, clinical patterns and radiological features of idiopathic osteoarthritis (OA) of the hip and the knee warranting arthroplasty.

Methods. A total of 402 Caucasians consecutively undergoing total hip replacement (THR) or total knee replacement (TKR) for idiopathic OA at a major centre was surveyed.

Results. Previous joint injury was more common in the TKR group (P < 0.0001). However, both groups manifested a mixed occupational background, body mass indices similar to the general population and a predominance of females (F:M = 1.3–1.4:1). The TKR group had a significantly younger age of symptom onset (56 yr) than the THR group (61 yr) but both groups had a tendency to bilateral arthroplasty (33%), nodal involvement (54–59%), a significant excess of right-sided replacements (1.8:1, THR; 2.2:1, TKR) and similar levels of pre-operative pain and disability. Up to 40% of hips manifested acetabular dysplasia and 10% possible previous slipped upper femoral epiphyses. Eighty-five per cent with end-stage coxarthrosis or gonarthrosis had an identical pattern of radiographic disease contralaterally.

Conclusions. Our data suggest the importance of a constitutional tendency to idiopathic, end-stage OA, a disorder traditionally associated with environmental factors leading to ‘wear and tear’.

KEY WORDS: Osteoarthritis, Idiopathic, End-stage, Symptomatic, Hip, Knee, Aetiology, Clinical, Radiographic.

Correspondence to: A. J. Carr.


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