Abstract
Infrapetellar osteochondroma is a rare benign osteochondromatous proliferation involving the infrapatellar fat pad. The pathogenesis of these lesions is unclear, but is thought to result from metaplasia of mesenchymal cells as a consequence of chronic infra-patella fat pad infringement or end stage of Hoffa’s disease1. Given its uncommon occurrence, it can be mistaken for more common conditions about the knee. The extra-articular location is distinct from cartilaginous loose bodies and synovial chondromatosis, which involve the joint space. Despite the name, this condition is not related to osteochondroma of bone. We report a case of infrapatellar fat pad osteochondroma and discuss features to distinguish this condition from morphologically similar lesions. Reference 1.Turhan E, Doral MN, Atay AO, et al. A giant extrasynovial osteochondroma in the infrapatellar fat pad: end stage Hoffa's disease. Arch Orthop Trauma Surg 2008; 128: 515–9.
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