There are several common causes of limited hip abduction: 1, hip dysplasia, due to the mismatch of the hip joint resulting in a smaller range of motion of the hip joint, resulting in limited abduction; 2, seen in femoral head necrosis, due to femoral head necrosis resulting in the collapse and deformation of the femoral head, resulting in a smaller range of motion of the hip joint resulting in limited abduction; 3, seen in ankylosing spondylitis or sacroiliac arthritis, often due to inflammation of the iliac It is often due to inflammation of the lumbar muscles and hip muscles, which restricts the abduction of the hip joint; 4. Sciatica, which is commonly caused by lumbar disc herniation and pear-shaped muscle outlet syndrome, is also due to muscle dysfunction caused by the nerves, resulting in limited abduction; 5.