Figure 5.

A 35-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 2.83 mm. (b) A proton density coronal image (repetition time, 3000 ms; echo time, 35 ms) 15 mm behind (a) shows a 22.9 mm transverse meniscus length. The meniscal extrusion transverse ratio was 0.12. (c) Arthroscopic imaging demonstrates a retracted and avulsed tear of the posterior root of the medial meniscus.