Ligament injuries around the knee may be complex if they occur together. Diagnostic accuracy and correct decision-making is necessary to allow these (often young) patients to return to top-level sport as soon as possible. Completely torn ligaments are often reconstructed with hamstring- or kneecap tendon grafts. These operations are carried out arthroscopically (keyhole surgery). Repair of ligaments is rarely indicated. Similar to hand surgery, an integrated management team is needed for rehabilitation, in order to ensure best results.