The results of the titanium-coated RM acetabular component at 20 years

Abstract

In a prospective study, 93 unselected consecutive uncemented hip arthroplasties were performed in 80 patients using the titanium-coated RM acetabular component and the CLS femoral component. The mean age of the patients at operation was 52 years (28 to 81). None were lost to follow-up. In the 23 patients who had died (26 hips) only one acetabular component had been revised. In the 57 living patients (67 hips), 13 such revisions had been performed. Of the 14 revisions, seven were for osteolysis, five for loosening and two for infection. Survival analysis of this implant showed a total probability of survival of 83% (95% confidence interval 73 to 90), with all revisions as the endpoint, and a probability of 94% (95% confidence interval 87 to 98) with revision for aseptic loosening as the endpoint, indicating reliable long-term fixation of the titanium-coated RM acetabular component.

A cementless, elastic press-fit socket with and without screws

“…Ihle et al (2008) also reported good long-term results for this cementless, titanium particle-coated socket. This socket is based on the philosophy that an elastic polyethylene RM socket (approx 1,000 N/mm 2 ), in contrast to a titanium-calcium phosphate rigid metal shell (approx 105,000 N/mm 2 ), provides the elastic properties of acetabular bone (approx 500–6,000 N/mm 2 ).…”

Survival outcomes of cemented compared to uncemented stems in primary total hip replacement

“…Advocates of cemented implants cite the excellent and reliable long-term reported survivorship [1][2][3] whereas proponents of cementless fixation contend that this method is equally reliable [4][5][6][7] and in fact superior in younger, highdemand patients [8,9] . Furthermore, cementless implants provide a broader range of options especially for the acetabulum where liner exchange may be required for postoperative instability; the commonest cause for early re-operation in all primary THR [10] .…”

La fixation acétabulaire sans ciment des prothèses totales de hanche de première intention

“…L'objectif est de préserver une épaisseur maximale de polyéthylène dont le revêtement de titane ne modifie pas l'élasticité, puisqu'il n'a pas de rigidité structurelle, et aussi de résoudre le problème de la micromobilité de l'insert en polyéthylène dans la cupule. Cette cupule a évolué depuis sa conception, mais ses résultats sont inté-ressants [35], en particulier vis-à-vis de l'ostéolyse [32] ;…”