Set of humeral components for total shoulder prosthesis
A set of humeral components for a total shoulder prosthesis, wherein each component is formed by an anchoring stem and a metaphyseal part which defines a concave surface of articulation in the form of a portion of a sphere. The offset between an axis of symmetry of this surface and a central axis of the metaphyseal part varies between the different components of the set. This makes it possible to limit or to avoid, by a reasoned choice of the humeral component used, an interference with the pillar of the scapula during a movement of adduction.
1. A set of humeral components for a total shoulder prosthesis, in which each component is formed having an anchoring stem and a metaphyseal part, said metaphyseal part including a concave surface of articulation in a form of a portion of a sphere formed in an end surface thereof, wherein an offset between an axis of symmetry of said concave surface and a central axis of said end surface of said metaphyseal part of said components is different for each component of the set, and wherein for each component, an orientation and position of said axis of symmetry of said concave surface is non-adjustably fixed with respect to said central axis of said end surface of said metaphyseal part thereof.
2. The set of components of claim 1 , wherein, for each component, said axis of symmetry and said central axis are substantially parallel.
3. The set of components of claim 1 , wherein, for at least one of said components, said axis of symmetry is located, with respect to said central axis, on an opposite side of a median axis of said stem.
4. The set of components of claim 3 , wherein said end surface of said metaphyseal part of each of said components defines an outer edge, said surface of articulation of at least one of said components extends to an immediate vicinity of said edge of said metaphyseal part along a portion of said edge that is spaced opposite another portion of said edge that is generally in line with said median axis of said stem.
5. The set of components of claim 3 , wherein said end surface of said metaphyseal part of each of said components defines an outer edge, said surface of articulation of at least one of said components is intersected by said edge of said metaphyseal part along a portion of said edge that is spaced opposite another portion of said edge that is generally in line with said median axis of said stem.
6. The set of components of claim 1 , wherein said components have substantially the same shape with an exception of positions of said articular surfaces in said metaphyseal part.
7. The set of components of claim 1 , wherein an angle of inclination of said axis of symmetry with respect to a median axis of said stem has substantially the same value for each of said components.
8. The set of components of claim 1 , wherein for one of said components, said offset is zero, said axis of symmetry and said central axis being merged.
9. A total shoulder prosthesis comprising, a glenoid component and a humeral component, a set of humeral components, each component of said set of humeral components being formed having an anchoring stem and a metaphyseal part, said metaphyseal part including a concave surface of articulation in a form of a portion of a sphere formed in an end surface thereof, wherein an offset between an axis of symmetry of said concave surface and a central axis of said end surface of said metaphyseal part of said components is different for each component of the set, wherein for each component, an orientation and position of said axis of symmetry of said concave surface is non-adjustably fixed with respect to said central axis of said end surface of said metaphyseal part thereof, and said humeral component being selected from said set of humeral components.
10. The total prosthesis of claim 9 , wherein said glenoid component includes a convex surface of articulation that is centered on an axis of symmetry which is not perpendicular to a rear face of said glenoid component that is adapted to come into abutment against a glenoid cavity.