After amputation, the major anatomical structures of the limb are partially missing and the physiological motor functions of this part are subsequently lost. The more defects there are, the more physiological functions are lost, and the more serious the dysfunction is. The more difficult it is to install and wear a prosthesis, the lower the application rate of the patient to the prosthesis. Lower limb amputation wearing a prosthesis when walking energy consumption is much larger than normal. First, the functional impairment of the upper limb after amputation The main function of the upper limb is to complete daily life activities and labor, the function of the upper limb is mainly through the hand to complete, even a small finger deficiency will make the grip of the hand decreased, a thumb deficiency so that the function of the hand lost 50%, because the loss of the palm function and can not grip pinch. When only the palm of the hand remains, only the functions of pushing, pulling, dragging, lifting and pressing are available. In the case of forearm amputation, all hand function is lost. Only the shoulder joint and the elbow joint have the ability to press and lift things in cooperation. Second, the dysfunction of the lower limb after amputation 1, the dysfunction of the foot after the cut-off: the amputation of a single toe has a small impact on standing and walking The big toe amputation has little impact on standing and walking in normal walking, but it will have an impact on fast walking or running, and the impact on jumping is even greater. Amputation of the second toe is associated with a bunion deformity, and the big toe tends to tilt toward the third toe to fill the remaining gap. Small toe amputations generally have little effect Patients with all toe amputations are generally less noticeable when walking slowly, but have significant impairment when walking fast and jumping that requires the elasticity of the foot, and have a significant effect on squatting and toe pads. These patients do not need to wear a prosthesis, only appropriate shoes. Metatarsal amputation will cause disability, the closer to the proximal metatarsal the more severe the disability, generally need to wear a prosthesis or orthopedic shoes. 2, ankle amputation (syme amputation) after the dysfunction of syme amputation although the weight-bearing stump is retained, but due to the loss of the whole foot so that the limb shortened, the weight-bearing area is reduced so that the stabilizing effect of the foot is weakened, the foot to the ground cushioning mechanism is lost, the ankle joint and toe plantarflexion so that the back push and pedaling function is lost, so you must wear a special syme prosthesis to get functional compensation. 3.Dysfunction after calf amputation Calf amputation is more serious than ankle amputation dysfunction, must wear calf prosthesis to complete double lower limb standing balance and walking. Patients with double calf amputation can still walk after wearing calf prosthesis if the residual limbs are in good condition, and can walk fast and even run and jump without the assistance of canes and so on. 4, thigh amputation dysfunction due to the loss of the knee joint, in the wearing of prosthetic rehabilitation training is more difficult, it takes a long time, the gait of the prosthesis is worse than the calf prosthesis, walking safety is also poor, the ability to have a great impact on daily life. 5.Dysfunction after hip disarticulation All lower limbs are missing, their lower limb function is completely lost, the stability and safety of hip disarticulation prosthesis is worse than thigh prosthesis, this part of the patient is only applicable to indoor and outdoor activities for a short distance, if you need long-distance activities, you need the help of crutches and wheelchairs.