Abstract: Methods of using cartilage implant devices are provided. The methods include locating articular cartilage having a lesion, and utilizing an implant having dimensions compatible with the lesion. The method further includes forming a cavity in the articular cartilage, subchondral bone, and cancellous bond, and engaging the implant with the cavity so that the lower face of the articular end of the implant abuts against the subchondral bone, and the stem of the implant abuts against the cancellous bone.

Abstract: Cartilage implant devices having oval articular ends are provided. The articular ends have a convex upper face and a concave lower face. The convex upper face has a first circular pitch radius and a first circular roll radius. The concave lower face has a first surface comprising a second circular pitch radius and a second circular roll radius, and at least two second surfaces each second surface having a third circular pitch radius and a third circular roll radius. The convex upper face blends into a rim, wherein at least a first and second portion of the rim extends at least a first distance along the vertical axis and a third and fourth portion of the rim tapers inward along the vertical axis, the rim blends into the concave lower face. The implant devices further have a stem extending from the concave lower face away from the convex upper face.