There are several possible causes for leg pain and walking: first, lumbar spine diseases, when there is a lumbar disc herniation or lumbar spinal stenosis, there will be leg pain, serious cases can not walk, then to carry out CT, nuclear magnetic examination of the lumbar spine for diagnosis; second, pear-shaped muscle syndrome, patients with pear-shaped muscle syndrome can appear hip pain, accompanied by one side of the leg pain, can also appear unable to walk. Third, knee diseases, when there is a serious knee osteoarthritis or knee tumor, can also appear leg pain can not walk phenomenon, then to carry out the knee X-ray and blood tests, magnetic resonance imaging for diagnosis; fourth, hip diseases, when the hip joint necrosis or tumor, impact syndrome, can also appear leg pain can not walk. Fourth, hip diseases, when the hip joint has femoral head necrosis or tumor, impingement syndrome, can also appear leg pain can not walk symptoms, then we should carry out the relevant hip X-ray, magnetic examination for diagnosis and treatment.