BACKGROUND AND PURPOSE Foveal triangular fibrocartilage complex (TFCC) lesion may cause distal radioulnar joint (DRUJ) instability. Dynamic radiostereometry (dRSA) has been validated for objective measurement of DRUJ kinematics. We evaluated DRUJ kinematics by dRSA before surgery and 12 months following open foveal reinsertion of the TFCC in comparison with contralateral non-injured DRUJs. PATIENTS AND METHODS In a prospective cohort study, 21 patients (11 men) of mean age 34 years (22-50) with arthroscopically confirmed foveal TFCC lesion were evaluated preoperatively, and at 6 and 12 months after open foveal TFCC reinsertion with QDASH, PRWE, pain on NRS, and bilateral dRSA imaging during a patient active press test motion cycle, including a force-loaded downstroke and a release phase. RESULTS Preoperatively, the force-loaded part (> 2.3 kg; 95% CI 1.6-3.0) of the press test motion cycle (from 15% to 75%) revealed a more volar position of the ulnar head in the sigmoid notch (DRUJ position ratio) and increased distance in DRUJs with foveal TFCC lesion compared with the patients' contralateral non-injured DRUJ (p < 0.05). 6 months postoperatively, the DRUJ position was generally normalized and remained normalized at 12 months. However, the DRUJ distance remained higher on the injured side. 12 months postoperatively, patients reported less pain during activities, with improved QDASH and PRWE scores (p < 0.007). INTERPRETATION DRUJ kinematics during the press test showed increased DRUJ translation to a more volar position of the ulnar head after foveal TFCC lesion compared with the contralateral non-injured DRUJs. Open foveal TFCC reinsertion had a stabilizing effect on DRUJ kinematics towards normalization, and improved patient-reported outcomes 6 and 12 months after surgery.

中文翻译：

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手术前和三角纤维软骨复合体开放中心凹重新插入后 12 个月的远端桡尺关节运动学：与对侧未受伤关节的比较。

背景和目的中心凹三角纤维软骨复合体 (TFCC) 损伤可能导致远端桡尺关节 (DRUJ) 不稳定。动态放射立体测量法 (dRSA) 已针对 DRUJ 运动学的客观测量进行了验证。我们通过 dRSA 在手术前和开放中心凹重新插入 TFCC 后 12 个月评估了 DRUJ 运动学，并与对侧未受伤的 DRUJ 进行了比较。患者和方法 在一项前瞻性队列研究中，对 21 名平均年龄 34 岁 (22-50) 的患者（11 名男性）进行了术前评估，并在术前以及使用 QDASH、PRWE 重新插入开放性中心凹 TFCC 后的 6 个月和 12 个月进行了评估、NRS 疼痛和患者主动按压测试运动周期期间的双侧 dRSA 成像，包括受力下压和释放阶段。结果 术前，受力部分（> 2.3 kg；95% CI 1.6-3.0) 的压力测试运动周期（从 15% 到 75%）显示尺骨头在乙状结肠切迹中的掌侧位置（DRUJ 位置比）和 DRUJs 与中央凹 TFCC 损伤相比的距离增加患者对侧未受伤的 DRUJ (p < 0.05)。术后 6 个月，DRUJ 位置基本正常化，并在 12 个月时保持正常化。然而，受伤侧的 DRUJ 距离仍然较高。术后 12 个月，患者报告活动时疼痛减轻，QDASH 和 PRWE 评分得到改善 (p < 0.007)。解释 按压测试期间的 DRUJ 运动学显示，与对侧未受伤的 DRUJs 相比，在中央凹 TFCC 损伤后 DRUJ 向尺骨头更掌侧位置的移动增加。