The purpose of surgery is for early activity, which can be as early as immediately after surgery. Internal fixation provides enough fixation strength for fracture stabilization to basically meet the need for early activity. Exercise can prevent many life-threatening problems, such as venous thrombosis, limb swelling, decubitus ulcers, pneumonia, urinary tract infections, etc. However, there is a rule of thumb that exercise should only be done under non-weight bearing until the fracture has healed. Studies have shown that the hip joint is three times heavier than your body weight when weight bearing, six times heavier when standing on one leg, and even more when running, so internal fixation with plates and screws alone cannot provide stability under weight bearing. 1. Is there a high rate of necrosis of the femoral head after femoral neck fracture? The results of a large sample of follow-up after femoral neck fracture are 33% of fracture healing, 33% of head necrosis and 33% of bone discontinuity after healing. 2.Why do we perform internal fixation surgery if the head necrosis and failure rate are high? Internal fixation surgery is a minimally invasive surgery with short operation time. The purpose of the surgery is to create a chance for fracture healing, especially for young people, in case the fracture does not heal before considering joint replacement or fusion. If joint replacement is performed prematurely, several joint revision surgeries are bound to be performed later; while for an elderly person over 65 years old, we will directly perform joint replacement surgery. 3.What exercises can I do after the internal fixation surgery? Before the fracture is healed after surgery, you can only do isometric muscle contraction exercises in the resting state of the joint and limb. You can turn over and bend your hip and knee in the lateral or semi-recumbent position. You can use a walker to go down to the ground in the lateral semi-recumbent position, but the affected limb cannot step on the ground to bear weight. 4.What are the movements that should never be done? You cannot do straight leg raise before the fracture heals. Give you a little data to understand, the hip joint withstand the force, straight leg raise is 1.5 times the weight, single-leg stand 2.5 times, double-leg stand 0.5 times, running is 5 times the weight. It is conceivable that a few screws cannot provide sufficient stability to the fractured broken end.