Fig. 3

Measurement of medial meniscal extrusion.On the fat-suppressed T2-weighted coronal image, the first vertical line was drawn intersecting the peripheral margin of the medial tibial plateau at the point of transition from horizontal to vertical. The second vertical line was drawn along the outer margin of the medial meniscus. The length between the first and second lines was defined as the measurement of meniscal extrusion. Osteophytes were excluded for determining the medial margin