This document discusses musculoskeletal disorders including joint dislocation, ligament injuries, and tendon ruptures. Joint dislocation occurs when trauma distorts and stresses the joint structures, blood supply, and nerves, which can lead to avascular necrosis or nerve palsy. Specific ligament injuries mentioned are to the anterior cruciate ligament and posterior cruciate ligament, as well as meniscal injuries and ruptured Achilles tendons.