Bow legs are a relatively common lower limb deformity, mainly caused by rickets or osteomalacia, leading to knee deformities. Other causes include anterior horn gray matter poliomyelitis, muscle injury, osteomyelitis, or other diseases that cause abnormal development of the femur or tibia. When the lower limb is extended, the femur and tibia form an outward angle, the two knees are close together, and the distance between the inner malleoli of the two feet increases, resembling an 'X' shape, known as genu valgum, commonly known as 'X-shaped legs'. The lesion usually occurs in the femur. When standing upright, the two lower limbs are arched outward, the two malleoli of the feet are close together, and the two knees cannot be brought together, with a large gap, resembling an 'O' shape, known as genu varum, also known as 'O-shaped legs' or 'rope legs', the lesion usually occurs in the tibia.
The main clinical manifestations are knee deformities, walking difficulties. In long-term cases, secondary symptoms such as relaxation of the lateral collateral ligament of the knee, degenerative arthritis, patellar dislocation, and patellar cartilage softening may occur, and corresponding symptoms will be caused. This disease is more common in children and adolescents, and can affect one or both lower limbs. Clinically, bow legs are more common. This disease occurs5Children can use conservative treatment. If it has exceeded5Years old, and those with severe deformities, then consider osteotomy correction surgery. Generally, timely treatment results in a good prognosis. Delayed treatment will cause joint complications. Even after late osteotomy correction, symptoms may still remain. Therefore, early diagnosis and early treatment are crucial.