Complete replacement of the joint with cement
This method pioneers were McKee-Farrar and Charnley in England in the late 50s and early 60s of the last century. The joint of McKee-Farrar was all metal and fixed cement. Due tribologit-metallic technology that is relatively primitive, it did not produce good enough results. Therefore, this joint was abandoned (although there is a revival now – see the section bearing metal on metal).
Charnley’s method quickly became successful in the world and to this day it is considered to be the “gold standard” in the hip replacement field. The method uses Polymethylmethacrylate Cement (PMMA) for fixing parts in the bones. The acetabulum is made of – Ultra High Molecular Weight Polyethylene Plastic (UHMWPE).
The prosthetic head and thighs are one part made of stainless steel 316. According to the Scandinavian registry (which is the best in the world so far) current leading methods used in cement and plastic-metal bearing include: Charnley, Exeter, Stanmore the British, and the – Lubinus made in Germany. Proper functioning can be observed in 80% of cases after 20 years.
In these methods (Complete replacement of the joint with cement) there are modorliot ways in which the head separately metal or ceramics – which make it easier to achieve the exact match. The disadvantage of using these implants is in the erosion of – UHMWPE which produces microscopic plastic particles that causes tissue scars: This tissue gradually dissolves the bone around the cement and causing bone loss and loosening of the implants. As a result, this will cause pain and inability to function during using the leg, and consequently, we will need to make the surgery again.
The search for improved UHMWPE resulted in the development of Highly Cross Linked UHMWPE and, at the time being, it is known that the transplant of this material is more resistant to erosion and has great results for the long term.