Sensitivity analysis of a cemented hip stem to implant position and cement mantle thickness.
Comput Methods Biomech Biomed Engin
; 17(15): 1671-84, 2014 Nov.
Article
en En
| MEDLINE
| ID: mdl-23405986
ABSTRACT
Patient-specific finite element models of the implanted proximal femur can be built from pre-operative computed tomography scans and post-operative X-rays. However, estimating three-dimensional positioning from two-dimensional radiographs introduces uncertainty in the implant position. Further, accurately measuring the thin cement mantle and the degree of cement-bone interdigitation from imaging data is challenging. To quantify the effect of these uncertainties in stem position and cement thickness, a sensitivity study was performed. A design-of-experiment study was implemented, simulating both gait and stair ascent. Cement mantle stresses and bone-implant interface strains were monitored. The results show that small variations in alignment affect the implant biomechanics, especially around the most proximal and most distal ends of the stem. The results suggest that implant position is more influential than cement thickness. Rotation around the medial-lateral axis is the dominant factor in the proximal zones and stem translations are the dominant factors around the distal tip.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Cementos para Huesos
/
Artroplastia de Reemplazo de Cadera
/
Fémur
/
Cadera
/
Prótesis de Cadera
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
Idioma:
En
Revista:
Comput Methods Biomech Biomed Engin
Asunto de la revista:
ENGENHARIA BIOMEDICA
/
FISIOLOGIA
Año:
2014
Tipo del documento:
Article