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. 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 ). treatment will depend on the cause of genu recurvatum. causes The following factors may be involved in causing this deformity: Inherent laxity of the knee ligaments Weakness of biceps femoris muscle Instability of the knee joint due to ligaments and joint capsule injuries Inappropriate alignment of the tibia and femur Malunion of the bones around the knee Weakness in the hip extensor muscles Gastrocnemius muscle weakness (in standing position) Connective tissue disorders. In these disorders, there are excessive joint mobility (joint hypermobility) problems. These disorders include: Marfan syndrome Ehlers-Danlos syndrome Benign hypermobile joint syndrome Osteogenesis imperfecta disease