The ACL is one of two central ligaments in the core of the knee. There is the anterior, and the posterior cruciate ligament. The two ligament stabilise the knee in lateral movements and ensure that the knee cap stays in place, and does not put strain the cartilage called menisci.

In a first time surgery, the hamstring muscle is most likely used. The hamstring is part of your thigh muscle on the back of your leg, and provides an elastic replacement for the ligament. In a second operation, however, if the hamstring has already been used, the surgeon must look elsewhere for reconstructive tissue. There are three options: a. hamstring from the healthy leg; b. a donated hamstring, so called allograft; or c. patella. The patella is located in the front of the knee, and most commonly used for second time ACL surgeries.
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