Pear-shaped muscle syndrome is caused by the following causes: 1, the most common is the injury to the pear-shaped muscle caused by the injection of drugs into the buttocks, when the gluteal muscular injection may damage the pear-shaped muscle. Due to the stimulation of chemical factors and injury factors, the pear muscle eventually produces contracture and may directly stimulate the sciatic nerve, resulting in pear muscle syndrome. 2, pear muscle syndrome may also be due to direct injury, or indirect injury of the scar triggered. The hip joint is damaged by direct impact or indirect torsional force, which eventually leads to scar contracture. 3, pear-shaped muscle syndrome may also be formed due to hip and pelvic fractures.