Abstract: Methods and apparatus for a tibial component of unicompartmental knee arthroplasty for creating a combination onlay/inlay pocket in an anterior area of a tibia. The pocket includes a cortical curved rim on one side and on the opposing side, an anterior “window” along the straight edge of a tibial spine. A cutting guide holds a cutter, which rotates and plunges back and forth to form the pocket in the tibia. The cutting guide is attached to a double tracks on the surface of a cam track cutting guide. The cutter cuts the tibia dictated by angles formed when the cutting guide rotates by moving along the double tracks of the cam track cutting guide. Once a pocket is formed, a combination onlay/inlay tibial implant is inserted into the pocket.

Abstract: A latch mechanism for a sewing machine bed extension including a spring biased latch button contained on the surface of the bed extension. The latch button actuates one extremity of a pivotally mounted lever having a tang at the locking extremity. The bed extension has a guide stud which engages an aperture in the base of the sewing machine. The tang passes through the guide stud to lock the bed extension to the base. The bed extension may be removed from the base by actuation of the latch button which causes the tang to disengage from the base.