A device for unicompartmental arthroplasty of the knee. The device permits arthroplasty of the medial and/or lateral tibial condyle, and allows for securing of the device without the use of bone cement. Such a device comprises a baseplate, the baseplate comprising a first surface configured to be secured to a surgically prepared medial (or lateral) compartment of a proximal end of a patients tibia, and an opposing second surface configured to replicate a medial (or lateral) tibial condyle a flange adjacent the baseplate, the flange shaped to interface with a surgically prepared anterior surface of the proximal end of the patients tibia, the flange comprising an orifice therethrough and at least one anchor protruding from the first surface, the at least one anchor arranged to coincide with at least one corresponding surgically prepared void in the patients tibia.
