Biomechanical, morphological, and histological analysis of early failures in hip resurfacing arthroplasty.
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Biomechanical, morphological, and histological analysis of early failures in hip resurfacing arthroplasty. / Morlock, M M; Bishop, N; Rüther, Wolfgang; Delling, G; Hahn, M.
in: P I MECH ENG H, Jahrgang 220, Nr. 2, 2, 2006, S. 333-344.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Biomechanical, morphological, and histological analysis of early failures in hip resurfacing arthroplasty.
AU - Morlock, M M
AU - Bishop, N
AU - Rüther, Wolfgang
AU - Delling, G
AU - Hahn, M
PY - 2006
Y1 - 2006
N2 - The present revival of hip resurfacing arthroplasty may be related to an increase in early failures owing to the challenging technique of the procedure. Fifty-five retrieved implants were analysed with respect to wear, cement mantle and cement penetration, fracture and head morphology, as well as standard histology. Femoral neck fractures occurred in median after 102 days. The time to failure was shorter for older women. Major deviations from the suggested cement mantle thickness and cement penetration were found. Indications for high trauma during implantation leading to early failure due to weakening of the femoral neck were also observed. Some failures had signs of pseudarthrosis beneath the implant. Four different fracture patterns with different mean survival times were identified. Observed wear was minor with the exception of that due to alignment mistakes (rim loading). The cups were not damaged by the failures. Histological results indicate that avascular necrosis is not necessarily connected with this kind of endoprosthetic surgery. Most of the failures analysed can probably be attributed to the 'learning curve' effect, which is an unsatisfactory situation.
AB - The present revival of hip resurfacing arthroplasty may be related to an increase in early failures owing to the challenging technique of the procedure. Fifty-five retrieved implants were analysed with respect to wear, cement mantle and cement penetration, fracture and head morphology, as well as standard histology. Femoral neck fractures occurred in median after 102 days. The time to failure was shorter for older women. Major deviations from the suggested cement mantle thickness and cement penetration were found. Indications for high trauma during implantation leading to early failure due to weakening of the femoral neck were also observed. Some failures had signs of pseudarthrosis beneath the implant. Four different fracture patterns with different mean survival times were identified. Observed wear was minor with the exception of that due to alignment mistakes (rim loading). The cups were not damaged by the failures. Histological results indicate that avascular necrosis is not necessarily connected with this kind of endoprosthetic surgery. Most of the failures analysed can probably be attributed to the 'learning curve' effect, which is an unsatisfactory situation.
M3 - SCORING: Zeitschriftenaufsatz
VL - 220
SP - 333
EP - 344
JO - P I MECH ENG H
JF - P I MECH ENG H
SN - 0954-4119
IS - 2
M1 - 2
ER -