Fig. 4.

MRI and arthroscopic images of a 21-year-old male (patient 2) who presented with pain and swelling in both knees. (a) Coronal T2-weighted image of the right knee showing a complex tear of the medial meniscus with the medial tibial plateau being completely covered. (b) Coronal T2-weighted image of the left knee showing complete discoid medial meniscus with a horizontal cleavage tear. (c) In probing of the peripheral side of the discoid medial meniscus of the right knee, a degenerative longitudinal tear running from the body portion to the posterior horn was observed, and the margin of the torn meniscus showed severe fatty degeneration. A subtotal meniscectomy was performed in the right knee. (d) Arthroscopic partial meniscectomy involving the torn meniscus was performed in the left knee. For the inner horizontal cleavage tear, the inferior surface was also resected.