A knee prosthesis constructed in accordance to the present disclosure includes a femoral component and a boss. The femoral component can have a first condylar portion and a second condylar portion connected by an inner condylar portion that defines an intercondylar recess, the inner condylar portion having a first engagement portion comprising a first plurality of engaging members extending therefrom. The boss can have a longitudinal body extending along a boss axis between first and second ends. The first end can be configured to selectively mate with a stem. The second end can include a second engagement portion comprising a second plurality of engaging members extending therefrom. The second engagement portion of the boss can be selectively coupled to the first engagement portion of the femoral component in a plurality of discrete positions to attain a corresponding plurality of angles of the boss axis relative to the femoral component.