Author/Editor		Kovač, S; Trebše, R; Milošev, I; Pavlovčič, V; Pišot, V
Title		Long-term survival of a cemented titanium-aluminium-vanadium alloy straight-stem femoral component
Type		članek
Source		J Bone Joint Surg Br
Vol. and No.		Letnik 88-B, št. 12
Publication year		2006
Volume		str. 1567-73
Language		eng
Abstract		We present a retrospective series of 770 cemented titanium straight-stem femoral components combined with two types of femoral head: cobalbchromium /CoCr) alloy (174 heads) and alumina ceramic (50 heads). Of the study group, 55 patients (55 stems) had died and six (six stemsl were lost to follow-up. At a mean of 73.7 years (3 to 15.3) 26 stems had been revised for aseptic loosening. The mean follow-up time for stable stems was 75.1 years (12.1 to 16.6). Survival of the stem at 15 years was 75.4% (95% confidence interval (CI) 67.3 to 83.5) with aseptic failure (including radiological failure) as the end-point, irrespective of the nature of the head and the quality of the cement mantle. Survival of the stem at 15 years was 79.7% (95% CI 69.8 to 88.4) and 67.7% (95% CI 51.3 to 82.9) with the CoCr alloy and ceramic heads, respectively. The quality of the cement mantle was graded as a function of stem coverage: stems with complete tip coverage (type 1) had an 84.9% (95% CI 77.6 to 92.2) survival at 15 years, compared with those with a poor tip coverage (type 2) which had a survival of only 22.4% 195% CI 2.4 to 42.41. The poor quality of the cement mantle and the implantation of an alumina head substantially lowered the survival of the stem. In our opinion, further use of the cemented titanium alloy straight-stem femoral components used in our series is undesirable.
Descriptors		HIP PROSTHESIS PROSTHESIS FAILURE TITANIUM ALUMINUM VANADIUM COBALT CHROMIUM ALLOYS CERAMICS MATERIALS TESTING RETROSPECTIVE STUDIES