Twenty-one patients underwent excision of a Campanacci grade III giant cell tumour of the distal radius and had reconstruction using a proximal fibula autograft. We compared the functional results of wrist arthrodesis versus arthroplasty. All 21 patients healed in an average of 8 months, and all have remained disease free. The Musculoskeletal Tumor Society 93, the Disabilities of the Arm, Shoulder, and Hand scores and the grip strength of the operated wrist compared with the contralateral wrist were 93%, 7, and 71% for the arthrodesis group and 83%, 17, and 40% for the arthroplasty group. Arthrodesis of the reconstructed radiocarpal joint provided better grip strength and functional outcomes than arthroplasty. Level of evidence: III