Deformation of the Zurich cementless acetabular cup caused by implantation in a canine cadaver model.
Vet Surg
; 46(3): 441-447, 2017 Apr.
Article
en En
| MEDLINE
| ID: mdl-28198543
ABSTRACT
OBJECTIVE:
To evaluate the change in geometry of the Zurich total hip arthroplasty (THA) acetabular component after implantation. ANIMALS Hemipelves from adult mix-breed dogs weighing between 20 and 25 kg.METHODS:
Digital image correlation imaging was performed prior to, immediately after, and 24 hours after impaction of Zurich THA acetabular component, and after removal of the cup from the specimen. Patterns of deformation were qualitatively described, and maximal deformations were compared between time points.RESULTS:
All cups deformed after implantation into the hemipelves by "pinching" in a cranial-caudal direction and dorsoventral expansion, resulting in an ellipsoid configuration to the peripheral rim. The mean ± SD maximum deformation at the rim immediately post-impaction was 0.202 ± 0.052 mm, or approximately 0.4 mm of diametrical deformation. Deformation did not change after the 24-hour saline bath. Impaction and subsequent extraction had a marginal effect on the original cup geometry, as maximum deformation at the rim after cup extraction was 0.074 ± 0.032 mm, relative to prior to impaction.CONCLUSIONS:
The original Zurich cup geometry is distorted as a consequence of the press-fit mechanism. Further studies are required to determine whether deformation induced by impaction has any association with polyethylene wear rates or other prosthesis-related complications.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Artroplastia de Reemplazo de Cadera
/
Prótesis de Cadera
/
Acetábulo
Tipo de estudio:
Evaluation_studies
Límite:
Animals
Idioma:
En
Año:
2017
Tipo del documento:
Article