There is a bilobed, or two adjacent osteochondromas arising from the left posteromedial femur, measuring approximately 8.8 cm vertically.
The proximal end of the lesion commences approximately 14.5cm
superior to the knee joint. The posterior component measures
approximately 2.5 cm in diameter in the medial lesion
measures approximately 4 cm. A very thin cartilage cap is present, measures less than 5mm in thickness.
The medial component protrudes into the vastus medialis,
adjacent to the septum between the medial and posterior
compartments. It lies just anterior the the adductor tendon.
The posterior component is adjacent to the popliteal artery
where there is no aneurysm. It indents the semimembranosus muscle, separated by a small bursa.
Severe tricompartmental degenerative change is noted in the
knee, not fully assessed, but there is extensive osteophyte
formation and loss of joint space. Small knee joint effusion
and intercondylar synovitis are present.