A modular humeral component for use in a shoulder joint arthroplasty, the modular humeral component comprising: a base member defining a taper cavity extending along a central axis of the base member； a head member having an articulating surface and a fixation surface opposite the articulating surface, the articulating surface having a center of curvature, the fixation surface comprising a first taper； and a coupling member configured to be received by the taper cavity, the coupling member defining a second taper configured to receive the first taper, the second taper configured to relocate the center of curvature from the central axis
