| 主权项 |
1. A method of using a kit, the kit comprising (a) a spacer for replacing a removed portion of a first bone and articulating with a second bone, (b) a bone-cutting bit having a cutting portion, and (c) a guide sized and shaped to guide the bone cutting bit, wherein:
the spacer comprises:
an articulating surface sized and shaped to articulate with an articular surface of the second bone; anda stabilizing surface sized and shaped to conform to a cut surface of the first bone, wherein:
the spacer defines first axis and a second axis not parallel to the first axis;in a cross-section of the spacer perpendicular to the first axis, the stabilizing surface defines a first curve including:
a first portion with a first radius of curvature; anda second portion with a second radius of curvature not equal to the first radius of curvature;in a cross-section of the spacer perpendicular to the second axis, the stabilizing surface defines a second curve including:
a third portion with a third radius of curvature; anda fourth portion with a fourth radius of curvature not equal to the third radius of curvature; andthe second and fourth radii of curvature are not equal; and the bone-cutting bit and the guide are sized and shaped such that, when the bone-cutting bit is guided by the guide, the cutting portion sweeps out a surface complimentary to the stabilizing surface of the spacer; wherein the method comprises: distracting a joint that comprises a first bone having a first articular surface and a second bone having a second articular surface; preparing the first bone by removing the first articular surface of the first bone by guiding the bone cutting bit with the guide, thereby creating a cut surface on the first bone complimentary to the stabilizing surface; placing the spacer with the stabilizing surface facing the complimentary cut surface of the first bone; and reapproximating the joint such that the articulating surface of the spacer articulates with the second articular surface of the second bone, and the stabilizing surface of the spacer fully seats against the cut surface of the first bone. |
