The meniscus disks in your knee are a type of this material that may tear if you twist wrong
These 
symptoms may go away in 1 or 2 weeks but can come back if you twist or overuse 
your... [DOC] [TLE] Discoid Meniscus-OrthoInfo - AAOS [PAR] A discoid meniscus is thicker than normal, and often oval or disc-shaped.