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A 30-year-old woman was admitted to our hospital with acute knee pain after she had fallen while downhill skiing. In this fall she went through a typical valgus trauma with external rotation in the right knee, in which she observed a direct pain and popping sensation. At the scene of the accident the knee was cooled directly and a pressure bandage was applied. One day later she presented at the out-patient clinic. The patient was able to bear weight on the right knee and pain was not a major problem. There was no locking, but she complained of giving-way. On inspection, a large effusion was present. On physical examination valgus stress was painful and tenderness of the medial collateral ligament was present. Range of motion was only slightly limited due to pain and effusion. Lachman sign was positive in comparison with the contralateral side. The conventional lateral knee radiograph showed an abnormal deep depression in the lateral femur condyle (figure 1A).
What is this indentation on the lateral femoral condyle and what causes it?
Additional MRI showed a prominent bone contusion at the location of the radiographically visible depression in the lateral femur condyle (figure 2). Remarkably, also …
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