Figure 8a. Anteroposterior (a) and lateral (b) radiographs of the left wrist in a patient with advanced rheumatoid arthritis show silicone prostheses and associated titanium grommets (Swanson finger joint implant; Wright Medical) in both the wrist and first MCP joints, as well as a Herbert screw (Zimmer) across the fused first interphalangeal joint. The wrist prosthesis is subluxed.