A modular prosthesis system for replacement of a head portion of a radius.
The prosthesis system includes a head component having a first connection
portion that connects to a second connection portion and a collar
component having the second connection portion and a third connection
portion. The system also includes a stem component including a fourth
connection portion that connects with the third connection portion, the
stem component having a stem anchoring portion that connects to the
radius. The collar component provides the modular geometry to the
prosthesis without having to have an increased number of head components
and stem components with variable lengths and angles.