目的 远端尺骨肿瘤切除后尺骨残端的重建和稳定仍然是一个有争议的问题。我们介绍了尺骨远端骨巨细胞瘤（GCTB）中尺骨残端未稳定的尺骨支撑关节置换术的结果。方法  使用肌肉骨骼肿瘤协会 93 (MSTS93) 评分、改良 Mayo 手腕评分 (MMWS) 和手臂、肩部和手部残疾 (DASH) 问卷来评估功能结果。我们还评估了握力、手腕运动范围和尺骨腕骨平移。结果  该研究纳入了 8 名尺骨远端 Campanaci 3 级 GCTB 患者，平均随访时间为 35.5±9.1 个月。平均切除长度为7.7±1.3cm。手术侧的平均握力为对侧的 90±0.04%。平均 MSTS93 评分为 27.9±1.25，平均 MMWS 为 86.9±4.58%，平均 DASH 评分为 4.9±1.67，显示出良好至优异的功能结果，残疾程度较低。所有患者均未发现桡腕不稳定、尺骨腕骨平移、突出或近端尺骨残端不稳定。结论  远端尺骨切除后，采用髂嵴植骨作为尺骨支撑重建远端尺骨关节，无需稳定尺骨残端，是一种有效的重建选择，具有良好的功能结果并保留良好的握力。证据级别 IV 级，治疗研究。Thieme。版权所有。

Purpose  Reconstruction and stabilization of ulnar stump after distal ulna tumor resection is still a matter of debate. We present the outcomes of ulnar buttress arthroplasty without stabilization of the ulna stump in giant cell tumor of bone (GCTB) of the distal ulna. Methods  Evaluation of functional outcome was performed using Musculoskeletal Tumor Society 93 (MSTS93) score, Modified Mayo Wrist score (MMWS), and Disabilities of the Arm, Shoulder, and Hand (DASH) questionnaire. We also assessed the hand grip strength, range of motion at the wrist, and ulnar carpal translation. Results  The study included 8 patients with Campanacci grade 3 GCTB of the distal ulna with a mean follow-up of 35.5 ± 9.1 months. The mean resection length was 7.7 ± 1.3 cm. The mean hand grip strength on the operated side was noted to be 90 ± 0.04% of the contralateral side. Mean MSTS93 score was 27.9 ± 1.25, mean MMWS was 86.9 ± 4.58%, and the mean DASH score was 4.9 ± 1.67, depicting a good to excellent functional outcome with low degree of disability. No radiocarpal instability, ulnar carpal translation, prominence, or instability of the proximal ulnar stump was noted in any patient. Conclusion  Reconstruction of the distal radioulnar joint using iliac crest bone graft for ulnar buttress without stabilization of the ulnar stump after resection of the distal ulna is an effective reconstruction option with good functional outcome and preservation of good hand grip strength. Level of Evidence  Level IV, Therapeutic study.Thieme. All rights reserved.