Anatomical radial head elbow prosthesis
AssigneeSignature Orthopaedics Europe Ltd
InventorsHarry Hoyen, William Duong, Chris Burgess, Declan Brazil
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Abstract
There is disclosed herein radial head elbow prosthesis which is anatomically designed to improve anatomical conformity and function and reduce likelihood of dislocation. Depression centroid eccentricity and orientation and raised lateral bearing surface aspects of the present radial head improve tracking of the radial head prosthesis of the capitellum and reduce likelihood of dislocation thereof.
Claims21
An elbow prosthesis comprising a radial head having a superior dished capitellum bearing surface and a medial-side radial notch bearing ulnar facet, the bearing surface defining a bearing surface centroid and having a depression formed therein forming a depression centroid, wherein the depression centroid is located anteriorly with respect to the surface centroid, wherein a ratio between the bearing surface centroid and the depression centroid and the depression centroid and a point at a rim of the bearing surface being closest the depression centroid is more than 25%.
An elbow prosthesis comprising a radial head having a superior dished capitellum bearing surface and a medial-side radial notch bearing ulnar facet, the bearing surface defining a bearing surface centroid and having a depression formed therein forming a depression centroid, wherein the depression centroid is located anteriorly with respect to the surface centroid, wherein the radial head defines an anterior face cross-sectional elevation profile which curves substantially uniformly from an undersurface of the radial head to the bearing surface and wherein the radial head defines a posterior face cross-sectional elevation profile which defines an s-bend overhang above which the posterior side transitions with less curvature and greater outward extent as compared to the anterior face.
An elbow prosthesis comprising a radial head having a superior dished capitellum bearing surface and a medial-side radial notch bearing ulnar facet, the bearing surface defining a bearing surface centroid and having a depression formed therein forming a depression centroid, wherein the depression centroid is located anteriorly with respect to the surface centroid, wherein the elbow prosthesis further comprises a stem having posterolateral curvature and wherein the posterolateral curvature comprises superior and inferior portions and an elbow forming a transition therebetween.
Dependencies are inferred from the claim text.