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Severely comminuted intraarticular distal radius malunion can significantly affect a patient's quality of life. To date, there is no ideal solution. We propose customized distal radius prosthesis replacement as a treatment option. A 33-year-old policeman presented with left wrist deformity and loss of motion for five months following a distal radius fracture AO (Arbeitsgemeinschaft für Osteosynthesefragen) type-C3 which had been fixed with a volar locking plate incorporate with external fixation and Kirschner wire (K-wire) augmentation for two months. He needed to rely on wrist motion for work. Therefore, we fabricated a customized distal radius prosthesis based on his contralateral normal anatomy to replace the malunion site. The patient was satisfied and able to return to work two months after the operation. Thirty months later, the range of motion had improved from fixed 40° flexion and fixed 70° pronation deformity to 73° flexion, 79° extension, 75° supination, and 85° pronation. His DASH (Disabilities of the Arm, Shoulder, and Hand) score had improved from 80 to 14.2. His pain score, as measured by the visual analog scale, improved from eight preoperatively to two. Unreconstructable intraarticular malunion of the distal radius is a challenging problem with no treatment consensus. Customized distal radius prosthesis may provide a successful treatment option. Future research should elucidate long-term outcomes.

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Case Report of Customized Distal Radius Prosthesis Replacement: An Alternative Treatment for Post-traumatic Unreconstructable Intraarticular Distal Radius Malunion