Ankle replacement system

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/42 (2006.01) A61B 17/90 (2006.01) A61F 2/30 (2006.01)

Patent

CA 2601090

A prosthesis suited for orthopedic implantation possesses a multi-piece stem component that supports an artificial joint surface that can articulate with another artificial joint surface in various ways. The prosthesis can be assembled in a snap fit and/or interlocking fashion that provides positive locking means without the use of screws or other fasteners. The prosthesis can accommodate fitment of a plastic joint surface made, e.g., from ultra high molecular weight polyethylene. The prosthesis is well suited for use in an ankle replacement system that can be installed using minimally invasive intramedullary guidance established with respect to the major axis of the tibia by minimally invasive access through the calcaneus, through an incision in the bottom of the foot. The prosthesis makes possible the installation of a total ankle system using minimally invasive anterior access to the ankle joint for making bony cuts and to install prosthesis components.

L'invention porte sur une prothèse orthopédique comprenant une tige en plusieurs éléments portant la surface d'une articulation pouvant s'articuler de plusieurs manières sur la surface d'une autre articulation. La prothèse, qui peut s'assembler par emboîtement/pression et/ou par autoblocage, ce qui permet de se passer de vis ou autres accessoires de fixation, peut comporter une surface d'articulation de plastique, par exemple de polyéthylène de poids moléculaire élevé. Elle est adapté à un système de remplacement de la cheville pouvant être mis en place à l'aide d'un système de guidage médullaire peu invasif pour ce qui concerne l'axe principal du tibia auquel on accède via le calcaneus par une incision faite à la base du pied. Elle permet en outre de mettre en place un système complet de cheville utilisant un accès antérieur peu invasif à l'articulation de la cheville pour les incisions de l'os et l'installation des composants de la prothèse.

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