Shoulder implant assembly

A method for selectively performing reverse and traditional arthroplasty for a shoulder joint that includes a humerus and a glenoid, the method comprising:

• providing a head having a first coupling taper with a first coupling profile, a cup having a second coupling taper with a second coupling profile equal to the first coupling profile and a humeral stem;
• providing a first adaptor with a coupling, said coupling having a peg defining a through bore, said through bore defining a first female coupling taper configured to selectively attach the first coupling taper or second coupling taper to the glenoid, said through bore further defining a screw head bearing surface;
• providing a stem defining a second female coupling taper configured to selectively attach to the first coupling taper or the second coupling taper to the stem;
• coupling the first adaptor to a glenoid;
• coupling a bone engaging screw to the first adaptor after coupling the first adaptor to the glenoid;
• and
• coupling the cup to one of the humeral stem or the first adaptor, wherein the first and second coupling tapers are configured to be interchangeably coupled to both the first adaptor and the stem.