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The Journal of Bone & Joint Surgery British Volume
Vol. 86-B, Issue 6 | Pages 933 - 933
1 Aug 2004
DEEP K NORRIS M SENIOR C


The Journal of Bone & Joint Surgery British Volume
Vol. 85-B, Issue 7 | Pages 980 - 982
1 Sep 2003
Deep K Norris M Smart C Senior C

There have been many reports which suggest that in patients with tibiofemoral osteoarthritis, a reduction in joint space is demonstrated better on weight-bearing radiographs taken with the knee in semiflexion than in full extension. The reduction has been attributed to the loss of articular cartilage in the contact area in a semiflexed arthritic knee. None of these studies have, however, included normal knees. We have therefore undertaken a prospective, double-blind, randomised study in order to evaluate the difference in the joint-space of arthroscopically-proven normal tibiofemoral joints as seen on weight-bearing full-extension and 30° flexion posteroanterior radiographs. Twenty-two knees were evaluated and the results showed that there may be a difference of up to 2 mm in the two views. This difference could be attributed to the inherent differential thickness of the articular cartilage in different areas of the femoral and tibial condyles and a change in the areas of contact between them.