Pressure disc prosthesis

The topic of the pressure disc prosthesis is meanwhile very critical to see. In particular, the early occurrence of loosening has brought the thrust washer prosthesis numerically in a niche existence.
Whether the pressure disc prosthesis disappears from the market or innovations will help you achieve a renaissance will show the future.

Synonyms

  • artificial hip joint
  • Total hip endoprosthesis (HTEP or HTE)
  • hip prosthesis
  • Hüfttotalendoprothese
  • HEP, TEP, HTEP
  • hip endoprosthesis

English: hip prosthesis

definition

The word "hip replacement" is synonymous with the term "hip joint endoprosthesis".
As part of a hip prosthesis implantation surgery, the human hip joint is replaced by an artificial, which consists in principle of the same parts. This means: In the context of such an operation one replaces the socket, the femoral neck and the femoral head.

In the pressure disc prosthesis, the "prosthesis stem" is anchored in a special shape.

An alternative prosthesis model is the pressure disc prosthesis

Pressure disc prosthesis

Although this form of prosthesis has already been developed in Switzerland about 20 years ago, it has only been on the market for several years. First, a pilot study of enlightened patients had to provide test results.

This form of prosthesis anchoring offers in comparison to the other (conventional) prosthesis models some advantages, but also known disadvantages, which will be discussed below

  • In contrast to the cemented or uncemented shaft-fixed prosthesis models, a much smaller part of the healthy bone has to be removed during the implantation of a pressure-disc prosthesis, because in this case only the femoral head itself has to be removed.
    This procedure is comparable to that of the new prosthetic development of the short stem prosthesis.
  • While the thigh is heavily loaded during the implantation of a hip prosthesis and, especially in the areas that are splinted by the prosthesis, the bone can not always be removed and built up as usual, a pressure disc prosthesis loads the bone throughout the course. This means that the elasticity of the bone is much less restricted, usually even unaffected.
  • Prosthesis loosening after inflammation or due to other factors is the most common reason for prosthetic replacement surgery. Since the relaxation of the hip prosthesis does not occur in its entirety, the prostheses in the bone are usually still very firmly anchored so that such a replacement operation places very great demands on the surgeon. Very often, a non-destructive removal of the old prosthesis is not possible due to the fixed anchorage. As a rule, a so-called window is sawn into the long bones. The consequence is then a relatively long duration of operation, associated with a significantly increased risk of complications. A Druckscheibenwechseleloperation is in loosening with relatively little effort either via a new print or a so-called normal hip prosthesis feasible.

The replacement operations listed under 3. are usually necessary after about 10 to 15 years. When implanted at a high age, the life of such a prosthesis is not really relevant.

However, if a younger patient needs a prosthesis, the likelihood of a necessary replacement operation is significantly increased. For a thirty-year-old patient, this can mean a two or even a three-fold change operation. However, since the anchoring options decrease with each change operation, the pressure disc prosthesis can initially serve as an alternative. If such a prosthesis is first implanted, the bone substance remains as an anchoring option for conventional models of hip prosthesis, and thus the quality of the subsequently performed replacement operations also increases.

durability

However, the pressure disc prosthesis shows - and this is critical to note at this point - in comparison to the classic prosthesis models, sometimes a much earlier occurring loosening rate.
Due to this increased loosening rate with premature necessary replacement surgery, this model of prosthesis is again used much less often than in the 1990s.
As already mentioned, this form of prosthesis is therefore to be recommended to young patients who want to achieve a postponement for the implantation of a conventional model with this prosthesis form.


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