Three-dimensional measurement of cemented femoral stem stability: an in vitro cadaver study.
Clin Biomech (Bristol, Avon)
; 15(4): 248-55, 2000 May.
Article
en En
| MEDLINE
| ID: mdl-10675665
ABSTRACT
OBJECTIVE:
To compare the in vitro stability of two cemented hip stem designs Stem I was a collarless, double-tapered, highly polished implant; Stem II had a collar and matt finish.BACKGROUND:
Stability of the femoral component of a hip implant is important for its long-term clinical success. Excessive migration or cyclic motion can increase the risk of early implant failure.METHODS:
The stems were implanted in paired human cadaver femurs, and custom-designed micromotion sensors were used to measure three-dimensional motions of the stems at proximal, middle and distal locations during simulated in vivo loading cycles.RESULTS:
This study found that despite 'rigid' fixation, cemented stems exhibit detectable motions under a limited number of cycles of simulated physiologic loads. At four times the donor body weight, Stem I showed a subsidence of 90 microm, compared to 25 microm of Stem II (P<0.05). In contrast, the proximal end of Stem II exhibited greater cyclic motions in the medial-lateral direction (P<0.05).CONCLUSIONS:
The different motion patterns could be due to the design differences, such as surface finish and geometry. RelevanceImplant design is an important factor related to the behavior of the cement/bone interface and the overall success of the implant. This study compares in vitro micromotion of two cemented femoral prostheses with differing proximal designs.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Falla de Prótesis
/
Cementación
/
Fémur
/
Prótesis de Cadera
Límite:
Aged
/
Aged80
/
Humans
/
Middle aged
Idioma:
En
Revista:
Clin Biomech (Bristol, Avon)
Asunto de la revista:
ENGENHARIA BIOMEDICA
/
FISIOLOGIA
Año:
2000
Tipo del documento:
Article
País de afiliación:
Suiza