Department of Orthopedic Surgery, Tokyo Women's Medical University, Shinjuku-ku, Tokyo, Japan.
Orthopaedic Foot and Ankle Center, Shiseikai Daini Hospital, Setagaya-ku, Tokyo, Japan.
Foot Ankle Int. 2022 Jun;43(6):796-799. doi: 10.1177/10711007221077099. Epub 2022 Apr 2.
Although varus-tilted distal tibial deformity is an established risk factor for chronic lateral ankle instability (CLAI), no studies have reported whether this deformity influences ankle instability after arthroscopic lateral ankle ligament repair (ALLR) for CLAI.
A total of 57 ankles from 57 patients who underwent ALLR for CLAI were retrospectively analyzed. Tibial articular surface (TAS) angles were measured on preoperative plain radiograph. After 12 months of follow-up, recurrent ankle instability and talar tilt angles on stress radiograph were evaluated as outcomes. Relationships between the TAS angle and these outcomes were assessed.
Recurrent ankle instability was observed in 10 ankles. The TAS angles of patients with recurrent instability were significantly lower (85.2 degrees vs 87.9 degrees). The receiver operating characteristic curve analysis revealed that the cutoff value of TAS angle for recurrent instability was 86.2 degrees. Based on this cutoff value, our patients were divided into 2 groups: low-TAS and high-TAS group. Univariate and multivariate analysis revealed that low TAS was an independent risk factor for recurrent ankle instability and greater postoperative talar tilt angles.
Varus-tilted distal tibial plafond appears to be a risk factor for recurrent ankle instability after ALLR.
虽然内翻倾斜的胫骨远端畸形是慢性外侧踝关节不稳定（CLAI）的既定危险因素，但尚无研究报告该畸形是否会影响 CLAI 关节镜下外侧踝关节韧带修复（ALLR）后的踝关节不稳定。
回顾性分析了 57 例接受 ALLR 治疗 CLAI 的患者的 57 个踝关节。在术前平片上测量胫骨关节面（TAS）角度。在 12 个月的随访后，评估复发性踝关节不稳定和应力位 X 线片上的距骨倾斜角作为结果。评估 TAS 角与这些结果之间的关系。
10 个踝关节出现复发性踝关节不稳定。不稳定的患者的 TAS 角度明显较低（85.2 度与 87.9 度）。受试者工作特征曲线分析显示，TAS 角用于复发性不稳定的截断值为 86.2 度。基于该截断值，我们的患者被分为低 TAS 组和高 TAS 组。单因素和多因素分析表明，低 TAS 是复发性踝关节不稳定和术后距骨倾斜角度较大的独立危险因素。
内翻倾斜的胫骨远端平台似乎是 ALLR 后复发性踝关节不稳定的危险因素。
