Characteristics and predictors of muscle strength deficit in mechanical ankle instability

作者：Zongchen Hou, Xin Miao, Yingfang Ao, Yuelin Hu, Chen Jiao, Qinwei Guo, Xing Xie, Feng Zhao, Yanbin Pi, Nan Li, Zhi‐yu Zhang, Dong Jiang · 发表于：BMC Musculoskeletal Disorders · 年份：2020 · DOI：10.1186/s12891-020-03754-9 · 被引用次数：22 · 研究领域：Foot and Ankle Surgery、Lower Extremity Biomechanics and Pathologies、Sports injuries and prevention

PURPOSE: Muscle strength training is a common strategy for treating chronic ankle instability (CAI), but the effectiveness decreases for mechanical ankle instability (MAI) patients with initial severe ligament injuries. The purpose of this study was to investigate the characteristics and the potential predictors of muscle strength deficit in MAI patients, with a view to proposing a more targeted muscle strength training strategy. METHODS: A total of 220 MAI patients with confirmed initial lateral ankle ligament rupture and a postinjury duration of more than 6 months were included. All patients underwent a Biodex isokinetic examination of the ankle joints of both the affected and unaffected sides. Then, the associations between the limb symmetry index (LSI) (mean peak torque of the injury side divided by that of the healthy side) and the patients' sex, body mass index, postinjury duration, presence of intra-articular osteochondral lesions, presence of osteophytes and ligament injury pattern (i.e., isolated anterior talofibular ligament (ATFL) injury or combined with calcaneofibular ligament injury) were analysed. RESULTS: There was significantly weaker muscle strength on the affected side than on the unaffected side in all directions (p < 0.05). The LSI in plantar flexion was significantly lower than that in dorsiflexion at 60°/s (0.87 vs 0.98, p < 0.001). A lower LSI in eversion was significantly correlated with female sex (0.82 vs 0.94, p = 0.016) and isolated ATFL injury (0...