Single-compartment knee arthroplasty

The implant includes a fixation feature that slidably receives the fixation element. These fixation features may be negative or positive features, such as undercut channels or struts. Examples include a single compartment tibial tray having a spine protruding from a bone-facing face, an undercut channel formed within the spine. Instruments for preparing spine receiving features in bone are disclosed. The implant and fixation element are configured for implantation without penetrating the cortical wall of the bone. Instruments and surgical methods are disclosed. 植入物包括滑动地接收固定元件的固定特征。这些固定特征可以是负或正特征，诸如底切通道或支柱。示例包括单间室胫骨托，其具有从向骨面突出的脊、形成在脊内的底切通道。公开了用于在骨中制备脊接收特征的器械。植入物和固定元件被构造成用于在不穿透骨的皮质壁的情况下进行植入。公开了器械和手术方法。