Highlights The distal Ulna is an unusual site (0.45%–3.2%) for a primary bone GCT. The functional reconstruction of the defect after resection has been a challenge. Many surgeons try to retain the ulna and perform the only curettage and packing with polymethylmethacrylate. Unfortunately, there is a high recurrence rate of up to 40% when treated in such a manner. Wide resection of the distal ulna with or without reconstruction or stabilization of the ulnar stump is the recommended treatment for GCTs in such locations. We present two patients with GCT of the distal ulna, all of them treated by wide resection of the distal ulna followed by stabilization of the remaining ulna using one half of the extensor carpi ulnaris (ECU) tendon. All the patient satisfied with the treatment.