Hip replacement material selection How long does a hip replacement last?

1 Hip replacement material selection

There are usually two types of hip replacement materials and four types.

The two types refer to the one placed on the side of the acetabulum. This one has an acetabular cup, which is placed on the outside and placed directly inside the acetabulum. A liner needs to be placed inside the cup. . Second, on the femoral side, the femoral side is usually composed of two parts. First, there is a prosthetic handle. This prosthetic handle is usually made of metal, some are made of cobalt-chromium-molybdenum alloy, and some are made of titanium alloy. Nowadays, it is usually the upper part. With a coat. Then there is the artificial femoral head. This artificial femoral head was originally a large head. Later, with the development of clinical progress and science and technology, it has now become a small head. It is also divided into different models.

There are basically three types of materials, the first is ceramic, the second is polyethylene with high cross-linking, and the third is metal. Because different materials can be mixed and matched with each other to produce different combinations. It is currently considered that the best prosthetic material is a ceramic lining against a ceramic bone, followed by a ceramic femoral head against a high cross-linked lining, and then the more common one in clinical practice, and the last one is a metal femoral head against a high cross-linking Coupled lining. 2 How long can hip replacement last?

According to previous sayings, after hip replacement, the lifespan of the prosthesis is ten to fifteen years. There is a slight difference between domestic and imported ones. The difference is about five years. about. However, with the recent updates of joint prostheses, the maturity of surgical technology, and the intervention of computer navigation and manual customization, the time for hip replacement has definitely been extended, and it has been significantly extended.

Let’s talk about the prosthesis first. In the past, hip joint replacements were usually cement-based prostheses. Cement-type prostheses have major shortcomings. First of all, they cannot guarantee the curing effect of bone cement. Therefore, from the first generation of bone cement, then the second generation, third generation, and now to the fourth generation, the cement is mixed under vacuum, which prolongs the use time of the cement and causes the prosthesis to sink and loosen after surgery. The chances of infection, infection and periprosthetic fractures are much less, especially since the introduction of bioprostheses recently. This bioprosthesis is more in line with human mechanics, and it does not use bone cement and has many micropores. Tissue can completely grow into these micropores, basically causing the prosthesis and femur to be integrated.

The second point is that surgical technology has been greatly improved. Although current hip replacement surgery is still a level four surgery in the orthopedic classification, it can actually be completed easily by many doctors.

The third point is the intervention of new technology and computer navigation, which allows the prosthesis to be placed more accurately. Then the emergence of 3D printing technology can realize the customization of artificial prostheses, which means that a set of prostheses can be customized according to one's own situation, without using large-scale industrial prostheses. 3. Is hip replacement easy to loosen?

Hip replacement actually replaces two parts, one is the acetabulum and the other is the femur. Currently, the metal part of the acetabulum is usually fixed with one or two screws, so this part of the acetabulum will basically not loosen. The femoral prosthesis is prone to loosening. The femoral prosthesis is mainly related to bone cement technology. In the past, it was the first and second generation bone cement, which has its own shortcomings. For example, there is a lot of foam in it, and the mixing is not special. Evenly. Now it has become the fourth generation of bone cement technology. The latest bone cement technology is more evenly mixed and the curing time of bone cement is shortened. Vacuum technology has also been invented. There are basically no bubbles when done under vacuum, so if you use this With bone cement technology, the chance of loosening of the hip femoral head prosthesis can be greatly reduced. Another point is that bone cement is rarely used in femoral prostheses at present, except during revision or in some relatively backward areas.

Nowadays, biological prostheses are used. There are macropores and micropores on the bioprosthesis, which mainly grow into the micropores through the surrounding tissue, and then are fixed with the femoral head. It's like using countless steel wires to tie two things together. Therefore, if there is no problem with the hip replacement surgery, do not overuse the joint after the surgery, especially do not get injured. The chance of loosening is not high. 4 Precautions for hip replacement

There are many things that need to be paid attention to during hip replacement. The focus now is on the things that need to be paid attention to after surgery. The purpose of hip replacement is to relieve this patient's pain and restore hip function. Therefore, rehabilitation exercises should be carried out early after surgery. However, there are some precautions for rehabilitation exercises that must be remembered:

First, do not cross your legs. The post-operative routine is for the patient to place a triangular pillow between the legs.

Second, when standing or sitting, do not lean forward more than 90 degrees.

The third is that after surgery, the hip joint should avoid adduction, internal rotation, and excessive external rotation, which can easily cause dislocation. Especially when standing, standing or lying down, the knees and toes cannot move inward. Pronation. It should represent the abducted neutral position, that is, the toes and knees are facing the ceiling, and the legs are turned outward.