TY - CHAP M1 - Book, Section TI - Knee Dislocation A1 - Breed, Meghan A1 - Fitch, Robert Warne A2 - Knoop, Kevin J. A2 - Stack, Lawrence B. A2 - Storrow, Alan B. A2 - Thurman, R. Jason PY - 2021 T2 - The Atlas of Emergency Medicine, 5e AB - Knee dislocations are classified by tibial displacement relative to the femur (anterior, posterior, medial, lateral, or rotatory). They invariably cause multiple ligamentous injuries and are usually the result of motor vehicle collisions, falls, sports, and industrial injuries. Anterior dislocations are more common and usually occur after high-energy hyperextension injuries. Knee dislocations are associated with popliteal artery and common peroneal and tibial nerve injuries. Popliteal artery injury can result from both anterior and posterior dislocations and is more common than nerve injury. Injury can be present despite normal pulses, and if not identified and repaired within 8 hours, amputation may be necessary. Common peroneal nerve injury can cause decreased sensation on the lateral foot, impaired dorsiflexion and eversion, and impaired sensation over the 1st dorsal web space. Knee dislocations can spontaneously relocate, so the physician must maintain a high index of suspicion. Injuries are painful and visually striking. An effusion will often be absent since the capsule has been violated. On exam, the knee will be grossly unstable since dislocations tend to injure most of the surrounding ligaments. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/03/28 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1181042120 ER -