http://orthoinfo.aaos.org/fact/thr_report.cfm?Thread_ID=277&topcategory=Knee
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American Academy of Orthopaedic Surgeons
One of the most commonly injured parts of the knee, the meniscus is a wedge-like rubbery cushion where the major bones of your leg connect. Meniscal cartilage curves like the letter "C" at the inside and outside of each knee. A strong stabilizing tissue, the meniscus helps the knee joint carry weight, glide and turn in many directions. It also keeps your femur (thighbone) and tibia (shinbone) from grinding against each other.