An implant system for total shoulder arthroplasties,hemi shoulder arthroplasties, and "reverse" total shoulder arthroplastiesincluding a humeral stem having an enlarged head portion with interfacesadapted to removably receive various modular interchangeablecomponents, such as articulating liners, spacers, and adapter inserts.The humeral stem functions as a universal platform that may be usedin either conventional or "reverse" total shoulder arthroplasties, as wellas hemi shoulder arthroplasties, and may remain implanted in placeduring a revision in which the implant system is converted between theforegoing configurations, for example.
