Figure 6.

A 55-year-old female with knee joint pain. (a) A proton density coronal image (repetition time, 3000 ms; echo time, 35 ms) of the knee at the mid-point shows extrusion of the medial meniscus with a distance of 2.19 mm. (b) A proton density coronal image (repetition time, 3000 ms; echo time, 35 ms) 15 mm behind (a) shows a 24.5 mm transverse meniscus length. The meniscal extrusion transverse ratio was 0.09. A small radial tear of the posterior horn of the medial meniscus was seen on arthroscopy but a root tear was not observed.