If an elderly person suffers from osteoporosis, minor trauma, such as a fall, can cause hip fracture, which generally includes femoral neck fracture and intertrochanteric fracture. If an elderly person suffers from hip pain, flexion, immobility and shortened external rotation of the lower limb after a fall, he/she should go to the orthopedic department of the hospital in time to take a frontal and lateral x-ray of the hip joint.