Augmented glenoid components and devices for implanting the same
A glenoid component for coupling to a scapula of a subject includes a body. The body includes an articulation surface adapted to articulate with a humeral component, and the body further includes a distal surface adapted to face the glenoid of the scapula. The distal surface includes a base surface portion adapted to face a first portion of the glenoid. The distal surface further includes an augmented surface portion adapted to face a second portion of the glenoid. The base surface portion and the augmented surface portion define an obtuse angle therebetween.
1. A system comprising:
a device for removing bone from a glenoid of a subject, the device comprising:
a handle adapted to be manipulated by a user;
a reaming head comprising a base and a reaming portion, the reaming portion comprising a proximal surface and a distal surface, the base extending proximally of at least a portion of the proximal surface of the reaming portion, the distal surface comprising at least one reaming edge adapted to engage and shape the glenoid;
a bearing connecting the reaming head to the handle, the bearing comprising a proximal portion and a distal portion, the proximal portion extending at an angle relative to a longitudinal axis extending through the distal portion of the bearing; and
a drive shaft rotatably supported by and extending through the bearing and having a distal end disposed within the reaming head, the drive shaft being rotatable about a drive shaft axis at the distal end, wherein the reaming head is adapted to be rotatably driven about a reaming axis by the drive shaft, the reaming axis being non-parallel to the drive shaft axis at the distal end; and
a glenoid component comprising:
a body including an articulation surface adapted to articulate with a humeral component, and the body further including a distal surface adapted to face a glenoid of the scapula, the distal surface including:
a base surface portion including a first convex surface adapted to face a first portion of the glenoid; and
an augmented surface portion including a second convex surface adapted to face a second portion of the glenoid;
wherein the base surface portion and the augmented surface portion are connected therebetween by an interface.
2. The system of claim 1 , wherein the articulation surface is concave.
3. The system of claim 1 , wherein when the drive shaft rotates the reaming head and the reaming head engages the glenoid, the reaming head reams the glenoid asymmetrically relative to the drive shaft axis.
4. The system of claim 3 , wherein the drive shaft is straight.
5. The system of claim 3 , further comprising a pivot coupling disposed laterally between the reaming head and the distal end of the drive shaft.
6. The system of claim 3 , wherein an intersection of the reaming axis and the drive shaft axis is disposed within the reaming head.
7. The system of claim 3 , wherein an angle between the reaming axis and the drive shaft axis is selectively adjustable.
8. The system of claim 3 , wherein the reaming head is configured to engage the glenoid to form a concave surface on the glenoid.
9. The system of claim 8 , wherein the reaming head is configured to engage an anterior portion, a supero-anterior portion, or an infero-anterior portion of the glenoid to form the concave surface.
10. The system of claim 8 , wherein the reaming axis is configured to be adjusted over a range of angles, said range of angles including a 15 degree angle relative to the drive shaft axis to form the first concave surface.
11. The system of claim 8 , wherein the concave surface is a first concave surface and the reaming head is configured to engage the glenoid to form a second concave surface on the glenoid.
12. The system of claim 11 , wherein the reaming head is configured to engage a posterior portion, a supero-posterior portion, or an infero-posterior portion of the glenoid to form the second concave surface.
13. The system of claim 12 , wherein the reaming axis is configured to be adjusted over a range of angles, said range of angles including a 35 degree angle relative to the drive shaft axis to form the second concave surface.
14. A kit comprising:
a device for removing bone from a glenoid of a subject, the device comprising:
a handle adapted to be manipulated by a user;
a reaming head comprising a base and a reaming portion, the reaming portion comprising a proximal surface and a distal surface, the base extending proximally of at least a portion of the proximal surface of the reaming portion, the distal surface comprising at least one reaming edge adapted to engage and shape the glenoid; and
a bearing connecting the reaming head to the handle, the bearing comprising a proximal portion and a distal portion, the proximal portion extending at an angle relative to a longitudinal axis extending through the distal portion of the bearing;
a drive shaft rotatably supported by and extending through the bearing and having a distal end disposed within the reaming head, the drive shaft being rotatable about a drive shaft axis at the distal end, wherein the reaming head is adapted to be rotatably driven about a reaming axis by the drive shaft, the reaming axis being non-parallel to the drive shaft axis at the distal end; and
a guide pin having a first end configured to be disposed in bone and a second end configured to be received within the cannulated drive shaft.
15. A glenoid component comprising:
a body including an articulation surface adapted to articulate with a humeral component, and the body further including a distal surface adapted to face a glenoid of a scapula, the distal surface including:
a base surface portion including a first convex surface adapted to face a first portion of the glenoid; and
an augmented surface portion including a second convex surface adapted to face a second portion of the glenoid;
wherein the base surface portion and the augmented surface portion are connected at an interface that forms a vertex of an obtuse angle defined by the base surface portion and the augmented surface portion.
16. The glenoid component of claim 15 , wherein the base surface portion has a first radius of curvature and the augmented surface portion has a second radius of curvature.
17. The glenoid component of claim 16 , wherein the first radius of curvature is different from the second radius of curvature.
18. The glenoid component of claim 15 , wherein the base surface portion has a curved shape in a longitudinal plane that is defined by the body, the longitudinal plane extending through the articulation surface and the base surface portion and is disposed apart from the augmented surface portion.
19. The glenoid component of claim 15 , wherein the augmented surface portion has a curved shape in a longitudinal plane that is defined by the body, the longitudinal plane extending through the articulation surface that is disposed apart from the base surface portion.
20. The glenoid component of claim 15 , wherein at least one anchor extends from the distal surface.