Instability hip prosthesis
A hip prosthesis is stabilised by the muscles, the hip capsule and the position of the prosthetic parts. If there is a problem with one of these stabilisers, the hip prosthesis may feel unstable and even dislocate. During the consultation with the orthopedic surgeon, the cause of the instability should be determined. In many cases, replacing the hip socket with an "antiluxation socket" can solve the problem.The procedure can be performed using the muscle-sparing, anterior approach (DAA), even if the hip has previously been operated on from the side or back.This prevents further damage to the hip muscles and allows for easy rehabilitation.
The stability of a knee replacement is extensively tested during the operation. A knee replacement that is too tight causes problems with bending, while a replacement that is too loose leads to complaints of instability. In addition, the function of the thigh muscles, which are attached to the kneecap, is essential for the correct function of the knee replacement. During the physical examination and additional X-rays, the cause of the instability can usually be determined.
Wear and tear of the prosthesis
Both the hip and knee prosthesis consist of titanium and cobalt chrome as well as polyethylene. Polyethylene is plastic and can wear out after 15-25 years. The orthopedic surgeon can detect this on X-rays and decide to replace the component.