Doherty Cailbhe, Bleakley Chris M, Hertel Jay, Caulfield Brian, Ryan John, Delahunt Eamonn
School of Public Health, Physiotherapy and Population Science, University College Dublin, Ireland;
Sport and Exercise Sciences Research Institute, Ulster Sports Academy, University of Ulster, Newtownabbey, County Antrim, United Kingdom;
J Athl Train. 2015 Jun;50(6):651-64. doi: 10.4085/1062-6050-50.1.09. Epub 2015 Mar 26.
No researchers, to our knowledge, have investigated the immediate postinjury-movement strategies associated with acute first-time lateral ankle sprain (LAS) as quantified by center of pressure (COP) and kinematic analyses during performance of the Star Excursion Balance Test (SEBT).
To analyze the kinematic and COP patterns of a group with acute first-time LAS and a noninjured control group during performance of the SEBT.
Case-control study.
University biomechanics laboratory.
A total of 81 participants with acute first-time LAS (53 men, 28 women; age = 23.22 ± 4.93 years, height = 1.73 ± 0.09 m, mass = 75.72 ± 13.86 kg) and 19 noninjured controls (15 men, 4 women; age = 22.53 ± 1.68 years, height = 1.74 ± 0.08 m, mass = 71.55 ± 11.31 kg).
Participants performed the anterior (ANT), posterolateral (PL), and posteromedial (PM) reach directions of the SEBT.
MAIN OUTCOME MEASURE(S): We assessed 3-dimensional kinematics of the lower extremity joints and associated fractal dimension (FD) of the COP path during performance of the SEBT.
The LAS group had decreased normalized reach distances in the ANT, PL, and PM directions when compared with the control group on their injured (ANT: 58.16% ± 6.86% versus 64.86% ± 5.99%; PL: 85.64% ± 10.62% versus 101.14% ± 8.39%; PM: 94.89% ± 9.26% versus 107.29 ± 6.02%) and noninjured (ANT: 60.98% ± 6.74% versus 64.76% ± 5.02%; PL: 88.95% ± 11.45% versus 102.36% ± 8.53%; PM: 97.13% ± 8.76% versus 106.62% ± 5.78%) limbs (P < .01). This observation was associated with altered temporal sagittal-plane kinematic profiles throughout each reach attempt and at the point of maximum reach (P < .05). This result was associated with a reduced FD of the COP path for each reach direction on the injured limb only (P < .05).
Acute first-time LAS was associated with bilateral deficits in postural control, as evidenced by the bilateral reduction in angular displacement of the lower extremity joints and reduced reach distances and FD of the COP path on the injured limb during performance of the SEBT.
据我们所知，尚无研究人员通过在星状偏移平衡测试（SEBT）过程中利用压力中心（COP）和运动学分析来量化与急性首次外侧踝关节扭伤（LAS）相关的伤后即刻运动策略。
分析急性首次LAS组和未受伤对照组在SEBT过程中的运动学和COP模式。
病例对照研究。
大学的生物力学实验室。
共有81例急性首次LAS患者（53例男性，28例女性；年龄=23.22±4.93岁，身高=1.73±0.09米，体重=75.72±13.86千克）和19例未受伤的对照组（15例男性，4例女性；年龄=22.53±1.68岁，身高=1.74±0.08米，体重=71.55±11.31千克）。
参与者进行SEBT的前向（ANT）、后外侧（PL）和后内侧（PM）伸展方向测试。
我们评估了SEBT过程中下肢关节的三维运动学以及COP路径的相关分形维数（FD）。
与对照组相比，LAS组在受伤侧（ANT：58.16%±6.86%对64.86%±5.99%；PL：85.64%±10.62%对101.14%±8.39%；PM：94.89%±9.26%对107.29±6.02%）和未受伤侧（ANT：60.98%±6.74%对64.76%±5.02%；PL：88.95%±11.45%对102.36%±8.53%；PM：97.13%±8.76%对106.62%±5.78%）肢体的标准化伸展距离均降低（P<0.01）。这一观察结果与每次伸展尝试期间以及最大伸展点时颞矢状面运动学轮廓的改变有关（P<0.05）。该结果仅与受伤肢体各伸展方向上COP路径的FD降低有关（P<0.05）。
急性首次LAS与姿势控制的双侧缺陷相关，这在SEBT过程中表现为下肢关节角位移的双侧减少以及受伤肢体的伸展距离和COP路径的FD降低。
