| 摘要 |
Methods of utilizing implant devices for the repair of articular cartilage defects are provided herein. The implant devices have circular, or oblong, articular ends. The articular ends have a convex upper face and a concave lower face, the convex upper face blending to the concave lower face, and the concave lower face having a curvature less than the curvature of the convex upper face. The implant devices further have a stem extending from the concave lower face away from the upper face, the stem having a maximum radius at the convex lower face and tapering to lesser radius along the length of the stem. |
| 主权项 |
1. A method of repair of articular cartilage comprising:
locating articular cartilage having a lesion; utilizing an implant of having dimensions compatible with the lesion, wherein the articular cartilage implant comprises;
an articular end for repair of articular cartilage defects, the articular end having a perimeter, a convex upper face, and a concave lower face, the convex upper face having a first circular pitch radius and a first circular roll radius, at least a portion of the concave lower face having a spherical radius, the convex upper face blending into a rim, wherein at least a first and second portion of the rim extends at least a first distance along a vertical axis and a third and fourth portion of the rim tapers inward along the vertical axis, the rim blending into the concave lower face;
wherein the first circular pitch radius ranges from about 15 to about 30 millimeters,wherein the first circular roll radius ranges from about 20 to about 40 millimeters; anda stem extending from the concave lower face away from the convex upper face along the vertical axis, the stem having a plurality of stem perimeters along the vertical axis;
wherein the stem has a first stem portion having a maximum stem perimeter extending at least one millimeter from the concave lower face away from the convex upper face along the vertical axis, the maximum stem perimeter being less than the articular end perimeter, and a second stem portion extending from the first stem portion away from the convex upper face along the vertical axis, the second stem portion having a plurality of second stem portion perimeters decreasing in stem diameter from the maximum stem perimeter of the first stem portion to a lesser second stem portion stem perimeter along the vertical axis of the stem; andwherein the stem has a plurality of circumferential grooves, wherein each circumferential groove extends continuously around at least one of the plurality of second stem portion perimeters, wherein at least one circumferential groove is defined between two adjacent second stem portion perimeters and has a shape of a partial, non-planar torus extending radially inward of the adjacent second stem portion perimeters, wherein the at least one circumferential groove blends into at least one of the two adjacent second stem portion perimeters,wherein the stem blends into the concave lower face, andwherein the articular end and the stem each consist essentially of: a graphite core and a pyrocarbon coating, forming a cavity in the cartilage and subchondral bone and cancellous bone; and engaging the implant with the cavity so that the lower surface abuts against the prepared subchondral bone and the stem abuts against the prepared cancellous bone. |
