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The full contact and the stump bearing capacity of the prosthetic socket

2018 / 02 / 05

Amputees wearing lower limbs when walking, people tend to focus on gait harmony. Only when the stump appeared bruising, discoloration, bearing and blood circulation problems, people are concerned about the stump of what happened. The changes of stump and absorb tolerance is inseparable stump socket.

The receptive cavity is the most important part of the prosthesis. It is directly related to the stump of contact, support body weight, control of prosthetic movement. The comfort of wearing a prosthesis depends entirely on whether the receptive cavity is appropriate. The receptive cavity is an important structure that affects the comfort and function of the prosthesis. The full contact and maximum stump bearing is the requirement of the assembly of the modern prosthesis assembly. Unfortunately, it is often ignored by people.

Weight bearing and exercise are the most fundamental functions of lower limb prostheses. The reliability of the stump and socket "connected" to ensure the implementation of artificial limb function. Any tiny "false joint" and "piston" between them will hinder the precise control of the limb amputees, thereby reducing the standing and walking stability, increase the energy consumption of the patient. Stump helps to achieve the goal to accept the stump and firmly connected between the cavity and the cavity to accept full contact. Full contact requires at least able to contact the stump, and can withstand the pressure. Otherwise, in the prosthetic, you should consider improving the quality of the stump by conservative or surgical methods.

Stump bearing maximum wearing ideal prosthesis, amputees should be able to use stump standing in the socket at the bottom, like standing on the ground before amputation. The maximum use of stump bearing is an important condition for the prosthetic limb to be physiological. Stump bearing not only has biomechanical significance, but also through the stump and contact load, the sensory nervous system can directly feel the amputee's important information from the bottom end of the pressure and movement.

The meromelia bone stump bearing load. It has the physiological function of preventing decalcification (passive osteoporosis). For children amputees, it can stimulate the growth of the stump.

The load-bearing capacity of the stump depends on the height of amputation and the quality of the soft tissue, depending on the surgical technique. Leg amputees, long limb stump load bearing ability is insufficient body weight 20%; section of medium length stump. Generally can withstand 30-60% weight; short stump bearing capacity is higher, even up to 100%. Stump thigh is about 20-30% of the bearing capacity. By disarticulation, cancellous bone near the joint part and keep all kinds of amputation stump of the plantar foot amputation to get exercise after a short period of time can be completely load-bearing, with 100% bearing capacity.

The full contact and stump bearing of the legs and thigh prostheses are the most prominent in the assembly of lower limb prostheses. Artificial leg and thigh prosthesis supported by stump proximal tibia, such as upper thigh or sciatic to stump free of charge. This will inevitably lead to venous and lymphatic flow barriers, stump swelling caused by. The parts of the thighs and the amputation of the legs pass through the tubular bone, and the weight bearing capacity of the stump is limited. Inevitably by the upper limb stump again breaks the stump bearing load, but should be free of charge to minimize the degree, to stump maximum bearing. In fact, the load-bearing capacity of the stump is higher than that of the general imagination.

The weight bearing capacity of the stump in the prosthesis is also dependent on the shape and material of the receptive cavity. The technology of silica gel leg and thigh prosthesis provides conditions for full contact and stump bearing in material and technology. Nevertheless, in today's leg and thigh prosthesis assembly, there are still many receptive chambers that do not meet the full contact and stump bearing requirements.

Some of the so-called "high grade" leg prostheses, although the use of very high quality and expensive materials, but also did not achieve full contact, not to talk about the stump bearing. The stump end and accept a great space between the bottom of the cavity, is the cause of stump discoloration bruising. As long as the Bush in the wear after press the bottom, it is easy to know the amputee socket to do the full contact. Some amputees spontaneously in the socket at the bottom of the cotton yarn, and to keep the contact pressure and residual limb. Their understanding of all contacts has surpassed the prosthetic technician. Expensive materials do not represent the quality of high grade prostheses.

The thigh prosthesis is a little better. Although the suction receptive cavity without residual contact still exists, the full contact cavity has been widely popularized and used.