Total artificial hip arthroplasty (THA) has been the most successful organ transplantation procedure in the last century. Through superb surgical methods and good prosthesis design, hip patients have been able to restore good function of their hip joints, even those hips that have been fused in earlier years can be re-truncated and replaced with joint replacements, thus obtaining relatively good hip function and restoring basic daily living standards. With the advancement of artificial joint replacement technology, there is a wide range of hip prostheses available, and patients are increasingly looking forward to a pain-free, functional artificial hip. Of course, I believe that the surgical technique of artificial joint replacement, i.e. the level of placement, is the key to the success of the surgery and the longevity of the joint, and that good materials are a relatively minor aspect. Therefore, I mentioned that some patients have been able to start flexing their knees, cross-legged and other functional demonstrations, which is of course a sign of good joint function, but I think it is necessary to remind the majority of patients that this movement is not suitable for everyone. First of all, THA is a surgery to solve the pain and improve the function of the hip joint, it is enough to solve the pain, not necessarily to be able to cross-legged, for example: patients with ankylosing spondylitis joint fusion, it is impossible to cross-legged after surgery, because the joint was too stiff before, patients with congenital hip dysplasia, some even high dislocation, during the operation has been extensive release of the hip joint, even the iliac The psoas muscle has been cut off, and some even osteotomy, so such patients are not suitable for planking, and it is enough to be able to wear socks. Secondly, whether or not planking is possible is very demanding for the surgery, and a good placement of the acetabulum and femoral stem prosthesis is required to obtain a good joint anterior tilt angle, so that planking can be achieved without the impact of the femoral stem and acetabular rim (which can lead to dislocation and wear of the hip joint); example. Patients with femoral head necrosis, DDH Crowe I-II, early ankylosing spondylitis, traumatic arthritis, rheumatoid arthritis, hip osteoarthritis, these patients, it is possible to achieve the planking motion, but only with the guidance of a physician, because the treating physician knows the specific situation, so that impingement will be avoided, so you cannot exercise blindly; again; only by taking The lateral and posterior lateral surgical approach can only be exercised in this way, and patients with anterolateral and straight anterior approach cannot do this action because of the high risk of dislocation in front of them. To sum up, planking is certainly a good function and a good exercise, but it should be done according to your ability and only with the guidance of your treating physician, remember! Remember!