Osteochondroma - femur

120 views550y Male10/9/2026

Clinical Presentation

Medial joint line knee pain.

1A large posteromedial bony projection is demonstrated involving the distal one quarter of the femoral shaft
2It is continuous with the medullary cavity and has an irregular medial margin without large soft tissue component or fracture
3Severe narrowing of the medial and patellofemoral joint compartments and marginal osteophyte formations indicate degenerative disease of the knee
4A large bilobed exostosis arises from the posteromedial aspect of the distal femoral diaphysis, extending into the metaphyseal region
5The medullary cavity of the exostosis is directly continuous with that of the femur and although the cortex is thinned in several areas, it remains intact.The exostosis indents and distorts the semimembranosus posteriorly, the sartorius medially, and the vastus medialis anteriorly but there is no soft tissue mass associated with this lesion
6No demonstrable cartilage cap
7No pathological fracture or periosteal reaction demonstrated
8There is a bilobed, or two adjacent osteochondromas arising from the left posteromedial femur, measuring approximately 8.8 cm vertically
9The proximal end of the lesion commences approximately 14.5 cm superior to the knee joint
10The posterior component measures approximately 2.5 cm in diameter, in the medial lesion measures approximately 4 cm