Extended articulation prosthesis adaptor and associated method

A shoulder prosthesis stem kit comprising:

• a stem for insertion into the humerus;
• a first member including a surface having a convex periphery adapted for articulation with the natural glenoid fossia, the convex periphery including a first articulating surface defining a generally circular outer periphery thereof and a second articulating surface extending from a portion of the circular outer periphery of the first articulating surface, said first member being removably cooperable with said stem;
• and
• a second member including a portion having a concave periphery, said second member being removably cooperable with said stem.

A shoulder prosthesis stem comprising:

• a stem for insertion into the humerus;
• an adapter removably connected to said stem;
• and
• a first member including a surface having a convex periphery adapted for articulation with the natural glenoid fossia, the convex periphery including a first articulating surface defining a generally circular outer periphery thereof and a second articulating surface extending from a portion of the circular outer periphery of the first articulating surface, said first member being removably connected to said adapter.

A method of treatment for shoulder cuff tear arthropathy comprising:

• Providing a shoulder prosthesis kit including a stem for insertion into the humerus, a first member including a surface having a convex periphery adapted for articulation with the natural glenoid fossia, the convex periphery including a first articulating surface defining a generally circular outer periphery thereof and a second articulating surface extending from a portion of the circular outer periphery of the first articulating surface, said first member being removably cooperable with said stem, a second member including a portion having a concave periphery, said second member being removably cooperable with said stem, and a third member for insertion into the natural glenoid fossia including a portion having a convex periphery, said third member being adapted for articulation with said second member.
• cutting an incision in the patient;
• preparing the humeral cavity;
• assembling the first member to the stem;
• inserting the first member and stem into the humeral cavity;
• sealing the incision;
• monitoring the condition of the patient;
• determining when one of the first member and the natural glenoid fossia are in need of replacement;
• removing the first member from the stem;
• placing the second member on the stem;
• and
• placing the third member on the natural glenoid fossia.