Reverse shoulder prosthesis and related methods
AssigneeSkeletal Dynamics LLC
InventorsJorge L. Orbay, Robert Sixto, Francisco Rubio
Life of this patent
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Abstract
Disclosed is a prosthetic joint assembly for joining a humerus bone to a scapula bone, comprising a humeral component adapted for engagement with said humerus bone and a concave dish; a scapular component adapted for engagement with said scapula bone and a convex surface adapted to engage said concave dish; wherein when said components are implanted and engaged in a rest position said prosthetic center of rotation is displaced in a direction that is inferior and medial relative to a natural center of rotation and said humerus bone is displaced in a direction that is inferior relative to said natural center of rotation.
Claims14
A prosthetic joint assembly for joining a humerus bone to a scapula bone, the humerus and scapula bones having a natural center of rotation relative to each other, the humerus bone having a humeral head the humerus bone being positionable with respect to the scapula bone between a rest position and an abducted position, the prosthetic joint assembly comprising:
- a humeral component having two opposite humeral ends, a first humeral end of the two opposite humeral ends comprising a humeral stem adapted for rigid engagement with said humerus bone and a second humeral end of the two opposite humeral ends comprising a concave surface;
- a scapular baseplate having a vertical dimension and two opposite baseplate sides, a first baseplate side of the two opposite baseplate sides adapted for rigid engagement with said scapula bone, and a second baseplate side of the two opposite baseplate sides comprising a trunnion, wherein the trunnion is offset inferiorly relative to a center of said vertical dimension, and wherein the trunnion comprises a first screw hole;
- a glenosphere component having two opposite glenosphere sides, a first glenosphere side of the two opposite glenosphere sides comprising an aperture adapted for rigid engagement with the trunnion, and a second glenosphere side of the two opposite glenosphere sides comprising:
- a convex surface adapted to engage said concave surface;
- and
- a second screw hole coaxial with the first screw hole and open to said aperture;
- and
- a screw component comprising:
- a first screw configured to interface with the first screw hole;
- a second screw configured to interface with the second screw hole;
- and
- a locking cap configured to rigidly engage said first screw with said second screw,
- wherein said screw component is configured to extend from the second screw hole, through the first screw hole, and beyond the first baseplate side to rigidly engage said glenosphere component with said scapula bone, and
- wherein when said concave surface and said convex surface are engaged said humeral component freely swivels with respect to said glenosphere component about a prosthetic center of rotation.
A method for prosthetically joining a humerus bone to a scapula bone, the humerus and scapula bones having a natural center of rotation relative to each other, the humerus bone having a humeral head, the humerus bone being positionable with respect to the scapula bone between a rest position and an abducted position, the method comprising:
- a. rigidly engaging a scapular component to said scapula bone, wherein said scapular component comprises:
- a scapular baseplate comprising:
- a first baseplate side adapted for rigid engagement with said scapula bone;
- and
- a second baseplate side comprising a trunnion, wherein the trunnion comprises a first screw hole;
- a glenosphere component comprising:
- an aperture adapted for rigid engagement with the trunnion;
- and
- a second screw hole coaxial with the first screw hole and open to said aperture;
- and
- a screw component comprising:
- a first screw configured to interface with the first screw hole;
- a second screw configured to interface with the second screw hole;
- and
- a locking cap configured to rigidly engage said first screw with said second screw,
- wherein said screw component is configured to extend from the second screw hole, through the first screw hole, and beyond the first baseplate side to rigidly engage said glenosphere component with said scapula bone;
- and
- b. rigidly engaging a humeral component to said humerus bone, said humeral component adapted to engage, and freely swivel with respect to, said scapular component about a prosthetic center of rotation;
- c. wherein upon engagement of said humeral component and said scapular component in said rest position, said humerus bone and said prosthetic center of rotation are displaced in a first direction that is inferior and medial relative to said natural center of rotation;
- d. wherein upon engagement of said humeral component to said scapular component in said rest position, said humerus bone is displaced in a second direction that is inferior relative to said natural center of rotation;
- and
- e. wherein the second direction is between 75 and 105 degrees below horizontal.
Dependencies are inferred from the claim text.