A modular implant assembly is provided for a shoulder joint having a humerus and a glenoid. The assembly comprises a base plate and a joint head having a convex outer surface and a generally planar base. The joint head is configured to couple with said base plate. The base plate is configured with means for fixation to the humerus and further comprises at least three radially displaced screws configured to attach said base plate to the humerus, wherein said screws attach to the peripheral cortical region of the humerus.
