METHODS AND DEVICES FOR LESS INVASIVE GLENOID REPLACEMENT
The invention relates to a glenoid (shoulder socket) implant prosthesis, a humeral implant prosthesis, devices for implanting glenoid and humeral implant prostheses, and less invasive methods of their use for the treatment of an injured or damaged shoulder.
1 . A method of treating a patient, comprising the steps of:
identifying a patient having a glenoid surface;
surgically exposing the glenoid surface,
reaming a circular cavity into the glenoid surface; and
inserting a glenoid implant into the cavity, the medial aspect of the implant having a circular geometry complimentary to that of the reamed bone cavity, such that at least a portion of a circular peripheral edge of the implant resides below the adjacent glenoid surface and the portion residing below the adjacent glenoid surface is circumferentially surrounded by cortical bone of the glenoid.
2 . A method of treating a patient as in claim 1 , wherein cortical bone surrounds the entire circular edge of the implant, for at least a portion of the height of the circular edge.
3 . A method of treating a patient as in claim 1 , additionally comprising the step of securing the implant within the cavity using bone cement.
4 . A method of treating a patient as in claim 1 , additionally comprising the step of securing the implant within the cavity by interference fit.
5 . A method of treating a patient as in claim 1 , additionally comprising the step of securing the implant within the cavity using a mechanical fastener.
6 . A method of treating a patient as in claim 1 , additionally comprising the step of stabilizing the implant within the cavity using a central peg extending from a medial surface of the implant.
7 . A method of treating a patient as in claim 1 , additionally comprising the step of accessing the glenoid via a deltopectoral approach.
8 . A method of treating a patient as in claim 1 , additionally comprising the step of accessing the glenoid via an anterolateral approach.
9 . A method of treating a patient as in claim 1 , wherein the reaming a cavity step comprises reaming a cavity completely within the boundary of the native glenoid cavity without destroying the peripheral margin of the glenoid surface.
10 . A method of treating a patient as in claim 1 , additionally comprising the step of accessing the glenoid via an incision no more than about 9 cm in length.
11 . A method of treating a patient as in claim 1 , wherein the reaming a cavity step is accomplished while leaving the majority of the inferior capsule intact.
12 . A method of treating a patient as in claim 1 , wherein the reaming a cavity step is accomplished while leaving the peripheral cortex intact.
13 . A method of treating a patient as in claim 1 , wherein the reaming a cavity step is accomplished using a power drill having a 90 degree bend.
14 . A glenoid implant, comprising:
a circular body, having a medial surface, an articulating surface, a peripheral edge, and a central axis;
a post on the medial surface, disposed concentrically on the central axis; and
at least one axially extending flange extending from the medial surface at the peripheral edge of the circular body.
15 . A glenoid implant as in claim 14 , wherein the at least one flange extends around at least about 75% of the peripheral edge of the circular body.
16 . A glenoid implant as in claim 14 , wherein the circular body has a first thickness measured in the axial direction at a first point on the peripheral edge, and a second thickness measured in the axial direction at a second point on the peripheral edge spaced apart from the first point by 180 degrees, and the first thickness is substantially equal to the second thickness.
17 . A glenoid implant as in claim 16 , wherein the first thickness is at least about 125% of the second thickness.
18 . A glenoid implant as in claim 16 , wherein the first thickness is at least about 150% of the second thickness.
19 . A glenoid implant as in claim 16 , wherein the first thickness is at least about 200% of the second thickness.
20 . A glenoid implant, comprising:
a circular body, having a medial surface, an articulating surface, a peripheral edge, and a central axis;
a post on the medial surface, disposed concentrically on the central axis; and
a first thickness measured in the axial direction at a first point on the peripheral edge, and a second thickness measured in the axial direction at a second point on the peripheral edge spaced apart from the first point by 180 degrees;
wherein the first thickness is at least about 125% of the second thickness.