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  • Implantable prostheses designed for partial replacement of the distal radioulnar head (i.e., radioulnar joint) at the wrist joint. These prostheses typically consist of two pieces: a metal (e.g., cobalt-chrome) ball resembling the ulnar head and a titanium stem that is surgically introduced in a hole drilled in the intramedullary canal of the ulnar bone; the stem may or may not be cemented to the bone. Radial/ulnar head partial wrist prostheses are intended to replace a damaged ulnar head, restoring it and stabilizing it relative to the distal radioulnar joint. Radial/ulnar head partial wrist prostheses used to treat pain caused by rheumatoid and degenerative arthritis or after trauma (e.g., fracture) of the radioulnar joint, typically after ulnar head resection arthroplasty.
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