A ligament is a sheet or band of very tough fibrous tissue that connects bones or cartilage at joints. The above figure shows an individuals left knee. The red identifies the ligaments in the knee. The two ligaments in the center are the anterior and posterior cruciate ligaments (ACL & PCL). The ligament on the right is the lateral collateral ligament (LCL). These ligaments are commonly injured in athletics and often require surgery and rehab to heal properly. Ligaments, like cartilage , do not have much vascular tissue to carry blood to them. When an injury occurs it does not heal as quickly as, lets say a muscle, because there is less blood to carry nutrients to those areas.
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