Glenoidal component, set of such components and shoulder prosthesis incorporating such a glenoidal component
This glenoidal component for a shoulder prosthesis comprises a base which may be immobilized on the glenoid cavity of a shoulder, and an element provided to be mounted on this base and forming a convex surface of articulation centred on an axis of symmetry. This axis of symmetry is non perpendicular to a rear face of the base intended to abut against the glenoid cavity, this making it possible to compensate a defect in parallelism between the resectioned surface of the glenoid cavity and the axis of the patient's spinal column. A surgeon can select the component in which the axes of symmetry of the components are oriented differently with respect to their rear faces.
1. A plurality of glenoidal components for a shoulder prosthesis, the plurality of glenoidal components comprising:
a first base comprising a front surface and a rear surface with a first stem comprising a longitudinal axis, the rear surface of the first base arranged at a first angle with respect to the longitudinal axis of the first stem;
a second base comprising a front surface and a rear surface with a second stem comprising a longitudinal axis, the rear surface of the second base arranged at a second angle with respect to the longitudinal axis of the second stem, the second angle being different from the first angle; and
an articular component mateable to the first base or the second base, the articular component comprising a convex articular surface, wherein
the first base comprises a wedge portion providing a larger rear-to-front distance at one area of the periphery of the first base than at another area of the periphery spaced away from the wedge portion.
2. The glenoid prosthesis of claim 1 , wherein the first angle is a nonperpendicular angle.
3. The glenoid prosthesis of claim 2 , wherein the second angle is a perpendicular angle.
4. The glenoid prosthesis of claim 1 , wherein a non-zero angle is defined between the front surface and the rear surface of the first base.
5. The glenoid prosthesis of claim 4 , wherein the front surface and the rear surface of the second base are parallel to each other.
6. The glenoid prosthesis of claim 4 , wherein the front surface of the first base is perpendicular to the longitudinal axis of the first stem.
7. The glenoid prosthesis of claim 6 , wherein the front surface of the second base is perpendicular to the longitudinal axis of the second stem.
8. The glenoid prosthesis of claim 1 , wherein at least a portion of the rear surface of the first base is not perpendicular to the longitudinal axis of the first stem.
9. The glenoid prosthesis of claim 1 , wherein the rear surface of the first base is planar.
10. The glenoid prosthesis of claim 9 , wherein the rear surface of the second base is planar.
11. The glenoid prosthesis of claim 1 , wherein the articular component comprises a projection extending from a side opposite the convex articular surface, and wherein each of the first base and the second base comprises a recess configured to receive the projection.