Shoulder implant components
A shoulder implant system includes a humeral stem implant, a humeral neck implant component, a humeral head implant component, and a glenoid implant. The humeral stem implant has a fin coupled to an exterior surface thereof that is inwardly tapered at an angle relative to vertical. At least a portion of the fin forms a wedge that directly engages and compacts cancellous bone during installation of the humeral stem implant. The humeral neck implant component is configured to be coupled with the humeral stem implant. The humeral head implant component is configured to be coupled to the humeral stem implant via the humeral neck implant component. The glenoid implant has a plurality of peripheral pegs. Each of the peripheral pegs has a plurality of sets of resilient lobes.
1. A glenoid implant to be coupled with a prepared glenoid of a patient, the glenoid implant comprising:
a body having:
a concave surface configured to engage a humeral head implant component, and
a convex surface configured to engage a mating surface of the prepared glenoid of the patient, the convex surface having a peripheral area surrounding a central area;
a central peg extending from the central area of the convex surface, the central peg being configured to be cemented to a central bore of the prepared glenoid of the patient, the central peg having a first length, a maximum outer diameter, a cylindrically shaped body, and a plurality of rigid fins extending from the cylindrically shaped body; and
a peripheral peg extending from the peripheral area of the convex surface, the peripheral peg having a first set of resilient lobes at a first longitudinal position of the peripheral peg and a second set of resilient lobes at a second longitudinal position of the peripheral peg that is spaced from the first longitudinal position, the peripheral peg having a second length that is less than the first length of the central peg and a maximum outer diameter that is larger than the maximum outer diameter of the central peg.
2. The glenoid implant of claim 1 , wherein the first set of resilient lobes has a first rotational orientation about the peripheral peg and the second set of resilient lobes has a second rotational orientation about the peripheral peg that is angularly offset from the first rotational orientation.
3. The glenoid implant of claim 1 , wherein each of the first set of resilient lobes and each of the second set of resilient lobes is configured to deform and deflect when initially engaged by cortical bone during installation of the glenoid implant in the prepared glenoid, and wherein upon final seating of the glenoid implant in the prepared glenoid, each of the first set of resilient lobes and each of the second set of resilient lobes is configured to engage with cancellous bone of the prepared glenoid.
4. The glenoid implant of claim 1 , wherein the first set of resilient lobes includes three lobes that are spaced about a circumference of the peripheral peg in a first rotational orientation and the second set of resilient lobes includes three lobes that are spaced about the circumference of the peripheral peg with a second rotational orientation that is angularly offset from the first rotational orientation.
5. The glenoid implant of claim 4 , further comprising a second peripheral peg extending from the peripheral area of the convex surface, the second peripheral peg having a third set of resilient lobes at a first longitudinal position of the second peripheral peg and a fourth set of resilient lobes at a second longitudinal position of the second peripheral peg that is spaced from the first longitudinal position of the second peripheral peg, the third set of resilient lobes including three lobes that are spaced about a circumference of the second peripheral peg in the first rotational orientation, the fourth set of resilient lobes including three lobes that are spaced about the circumference of the second peripheral peg with the second rotational orientation.
6. The glenoid implant of claim 4 , wherein for each of the first and second sets of resilient lobes, the three lobes are spaced generally equally about the circumference of the peripheral peg.
7. The glenoid implant of claim 1 , responsive to the glenoid implant being coupled with the prepared glenoid such that (i) at least a portion of the convex surface directly engages a mating surface of the prepared glenoid, (ii) the central peg is positioned within a central bore of the prepared glenoid, and (iii) the peripheral peg is positioned within a peripheral bore of the prepared glenoid, the first set of resilient lobes and the second set of resilient lobes are configured to engage cancellous bone of the prepared glenoid and provide a sufficient amount of self-pressurization such that bone cement between the central peg and the central bore can cure without an external force holding the glenoid implant in position.
8. The glenoid implant of claim 7 , wherein the first set of resilient lobes and the second set of resilient lobes are further configured to provide a sufficient amount of self-pressurization such that bone cement between the central peg and the central bore can cure with the at least a portion of the convex surface maintaining its direct engagement with the mating surface of the prepared glenoid without the external force.
9. The glenoid implant of claim 1 , wherein the cylindrically shaped body includes a first end that is integral with the body and a second opposing end that forms a tapered tip portion.