Modular Radial Head Prostheses

A prosthesis system for replacement of a head portion of a proximal radius, comprising:

• a first articulation component having a cylindrical intermediate portion disposed between an articulating surface and a connection portion, the intermediate portion including a first locking portion disposed circumferentially about the intermediate portion;
• a head component defining a counterbore for receipt of the intermediate portion, the counterbore having a second locking portion that mates with the first locking portion to form a first locking mechanism to initially couple the first articulation portion to the head component, the head component defining a locking channel distally of the counterbore that receives the connection portion;
• a stem component having a protrusion receivable in the locking channel and defining a bore, the stem component adapted to be coupled to the radius;
• and
• a fastener received through the locking channel and into the bore to provide a second locking mechanism that couples the articulation component and the first head component to the stem component.

A method for assembling a prosthesis system for replacement of a head portion of a proximal radius, comprising:

• selecting an articulation component from a plurality of articulation components each having a distinct dimension and a first locking portion;
• selecting a head component having a second locking portion and a locking channel;
• snapping the first locking portion into the second locking portion to lock the selected articulation component to the head component;
• inserting a portion of a stem component into the locking channel of the head component;
• and
• locking the stem component to the head component and the articulation component.