It has the advantages of light weight, multi-function, strong compensation ability and easy popularization of factory production. It has become an indispensable life partner for amputees. However, due to the wide variety of modern prosthetic products, great differences in function, and the recommendation of some so-called marketers, amputees are at a loss in the choice of prosthetic products. Compared with the traditional prosthesis, the modern prosthesis has a lot of changes in function.

Prosthetic experts said: the selection of prosthetic limbs in china should be based on the patient's physical fitness, residual limb conditions, individual personality, professional habits, exercise ability, use environment and economic status, etc., which should be evaluated by rehabilitation doctors and rehabilitation engineers before scientific selection.

The compensatory ability of lower limb prosthesis can basically meet the requirements of daily life

Lower limb prosthesis refers to the prosthesis installed in each part of the amputation from below the pelvis to above the toe joint. The purpose of installing lower limb prosthesis is to make up for the defect of lower limb and replace the function of human support and walking. The basic structure of lower limb prosthesis is composed of artificial foot, joint, integrated connecting tube and receiving cavity which can accommodate the residual limb and transmit strength.

Prosthetic rehabilitation: according to the different parts of amputation, lower limb prosthesis includes hip amputation prosthesis, thigh prosthesis, knee amputation prosthesis, leg prosthesis, sym prosthesis, schobert prosthesis, etc. In general, the higher the amputation site, the higher the requirements for the function and device of the prosthesis

Most of the modern lower limb prostheses are skeletal prostheses, which are connected by many standard components. This is not only conducive to factory production and promotion, but also effectively promotes the technical innovation of prosthetic products.

Especially with the progress of information technology, titanium alloy, carbon fiber and other materials with light weight, high strength and high elasticity are widely used. Both the quality and the function of prosthetic products have made a qualitative leap, and the humanized selection can be made to quickly customize the lower limb prosthetic products with different requirements. The compensatory ability of lower limb prosthesis products can basically meet the daily life requirements of amputees.

However, the lower limb prosthesis is still basically unpowered prosthesis, that is to say, the lower limb stump and body swing are the power sources to drive the motion of the prosthesis, that is to say, the prosthesis itself has no power. Although the support period can provide enough stability, but the swing period is not satisfactory, especially the prosthesis products with knee amputation. Although pneumatic and hydraulic assisted knee extension has been developed, it still consumes a lot of physical strength when walking, the walking speed can not be adjusted at will, and there is still a lot of room for improvement of gait.

At present, intelligent artificial limbs and powered legs have been developed in foreign countries, but due to the problems of high price and maintenance, there is still a long way to go from ordinary residents.

The right prosthesis

In the outpatient department, there are often some amputees who complain that their prosthetic products are not ideal in use. If they are not careful, they are easy to fall down. Some people are not satisfied with their gait, and some even complain that the prosthesis creates trouble for themselves.

Introduction of rehabilitation specialist: the selection of lower limb prosthesis should be based on the assessment of rehabilitation doctors and rehabilitation engineers according to their age, physique, residual limb conditions, use environment, exercise ability, etc. Prosthetic choice is not more function or the more expensive the better, but suitable for their own is right

Clinically, many amputees who have just regained their self-confidence always hope to install a prosthesis with the most functions and the best. The marketing personnel of prosthetic companies will blindly cater to patients and recommend the latest and most expensive prosthesis. But in fact, even the most functional and most powerful prosthesis does not necessarily fit every amputee.

Human walking can be divided into supporting period and swinging period from heel following to re landing on the same side. The lower limb prosthesis is also the same. During the supporting period, it is required to be stable enough to adapt to all kinds of roads. In the swing period, it is required to be easy, flexible and controllable, so as to ensure easy and safe walking and good gait.

At present, although the lower limb prosthesis has developed a variety of functions such as energy storage, shock absorption and buffering, pneumatic (hydraulic) pressure assisted extension control, knee flexion, gyration and other functions, as well as bionic intelligent artificial limbs and power legs, the "blade fighter" can even compete with the healthy people in the field, but no mature and optional control technology has been developed. Yang suggested that the choice of prosthetic limb should respect daily life and choose between safety and flexibility.

For the patients with lower limb amputation, such as older age, poor physique, shorter stump or living in mountainous areas, it is better to choose the lower limb prosthesis with ankle movement or lower sports level. This kind of prosthesis has strong adaptability to the road surface, high safety and easy to control; young and middle-aged patients and patients with better residual limb conditions can choose the lower leg prosthesis with high energy storage and higher movement level, which helps him return to work and has an ideal gait.

Patients with amputation above knee amputation, such as older age, poor physique, short stump or living in mountainous area, should choose multi axis knee joint or even knee joint lockable prosthesis. When choosing prosthesis, we must emphasize flexibility and gait on the basis of safety, otherwise it will bring a lot of trouble.

For patients with better economic conditions, pneumatic (hydraulic) pressure assisted extension control, bionic and bionic intelligent prosthesis can be considered. Even if the bionic intelligent artificial limb can only play its functional advantages when walking on the smooth road and walking on the platform level.

In the process of prosthesis assembly, the manufacturing technology of socket is very important in the installation of prosthesis

The prosthetic socket is an important mediator connecting the stump and the prosthesis components. It can store the residual limb in it and play the role of carrying the body weight, transmitting the force and controlling the prosthesis.

The prosthetic rehabilitation surgeon said: the prosthetic socket should conform to anatomy and biomechanics, and it should be comfortable in use, which is responsible for the function of power transmission and motion transmission. The design and manufacture of the prosthetic socket is a key link in the prosthetic device

All amputees who have worn prosthetics know that the residual limb is affected by various forces such as rotation force, friction force, torsion force and impact force in the receiving cavity. In addition, there are many factors such as the UN stressed bone process and irregular shape, skin sensitivity, surgical scar and other factors, and some even serious deformation affects the alignment of the prosthesis, which should be carefully considered and solved in the design and manufacture of the prosthetic socket.

At present, the prosthetic socket is mostly full contact type. Compared with the radical insertion type, the technology has made obvious progress. For example, the thigh socket has changed from the insertion type to the quadrilateral bearing socket, and then to the ischial inclusion and ischial branches containing the receiving cavity. Especially, the application of lining materials such as silica gel can solve the invalid force inside the socket and improve the efficiency The power transmission performance and comfort of the receiving cavity.

Finally, the prosthetic rehabilitation therapist reminds everyone that prosthetic limb is not a commodity but a product. Please choose the device in an experienced rehabilitation service institution to ensure the product quality and device manufacturing quality, and ensure the follow-up service.