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Genu recurvatum is a deformity in the knee joint, so that the knee bends backwards. In this deformity, excessive extension occurs in the tibiofemoral joint. Genu recurvatum is also called knee hyperextension and back knee. This deformity is more common in women and people with familial ligamentous laxity. Hyperextension of the knee may be mild, moderate or severe. The normal range of motion (ROM) of the knee joint is from 0 to 135 degrees in an adult. Full knee extension should be no more than 10 degrees. In genu recurvatum (back knee), normal extension is increased. The development of genu recurvatum may lead to knee pain and knee osteoarthritis. ==Knee stabilization== The most important factors of knee stability include: * Ligaments of the knee: The knee joint is stabilized by four main ligaments: * * Anterior cruciate ligament (ACL). The ACL has an important role in stabilization of knee extension movement by preventing the knee from hyperextending. * * Posterior cruciate ligament (PCL) * * Medial collateral ligament (MCL) * * Lateral collateral ligament (LCL) * Joint capsule or articular capsule (especially posterior knee capsule) * Quadriceps femoris muscle * Appropriate alignment of the femur and tibia (especially in knee extension position ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Genu recurvatum」の詳細全文を読む スポンサード リンク
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