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Inside the knee joint are two major ligaments: the cranial cruciate ligament (CrCL) and the caudal cruciate ligament (CaCL). The CrCL is frequently ruptured in severe twisting injuries of the knee. Surgical stabilisation is indicated to reduce the joint instability and associated degenerative changes. Many different surgical techniques are used to repair a CrCLR: surgical ligament replacement; mechanical osteotomy procedures and, in severe or complicated cases, a total knee replacement (TKR) may be necessary. Physiotherapy can be helpful before and after surgery in order to re-establish muscle strength and mobility in these cases.