Atypical presentation of intra-articular osteochondroma of k
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Osteochondroma is most common benign bone tumor around the knee joint. They occur during the period of growth, grows away from the joint line and rarely responsible for mechanical symptoms. This paper reports a rare presentation of the intra-articular osteochondroma in a knee with mechanical instability symptoms, mild to moderate pain and swelling of the knee joint. The patient was 20 years old male and misdiagnosed as chronic nonspecific synovitis, tubercular arthritis and anterior cruciate ligament tear of the knee. He was assessed clinically and radiologically and the diagnosis was established based on MRI and arthroscopy. He was treated by open excision of the tumor, and patients recover uneventfully. Instability of knee joint, in this case, can be attributed due to the rough surface of osteochondroma just beneath lower attachment of patellar tendon.

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