Fox Jason, Docherty Carrie L, Schrader John, Applegate Trent
Indiana University, Bloomington, IN 47408, USA.
J Athl Train. 2008 Jan-Mar;43(1):51-4. doi: 10.4085/1062-6050-43.1.51.
Inversion ankle sprains can lead to a chronic condition called functional ankle instability (FAI). Limited research has been reported regarding isokinetic measures for the plantar flexors and dorsiflexors of the ankle.
To examine the isokinetic eccentric torque measures of the ankle musculature in participants with stable ankles and participants with functionally unstable ankles during inversion, eversion, plantar flexion, and dorsiflexion.
Case-control study.
Athletic training research laboratory.
Twenty participants with a history of "giving way" were included in the FAI group. Inclusion criteria for the FAI group included a history of at least 1 ankle sprain and repeated episodes of giving way. Twenty participants with no prior history of ankle injury were included in the control group.
INTERVENTION(S): Isokinetic eccentric torque was assessed in each participant.
MAIN OUTCOME MEASURE(S): Isokinetic eccentric testing was conducted for inversion-eversion and plantar-flexion-dorsiflexion movements. Peak torque values were standardized to each participant's body weight. The average of the 3 trials for each direction was used for statistical analysis.
A significant side-by-group interaction was noted for eccentric plantar flexion torque (P < .01). Follow-up t tests revealed a significant difference between the FAI limb in the FAI group and the matched limb in the control group. Additionally, a significant difference was seen between the sides of the control group (P = .03). No significant interactions were identified for eccentric inversion, eversion, or dorsiflexion torques (P > .05).
A deficit in plantar flexion torque was identified in the functionally unstable ankles. No deficits were identified for inversion, eversion, or dorsiflexion torque. Therefore, eccentric plantar flexion strength may be an important contributing factor to functional ankle instability.
内翻性踝关节扭伤可导致一种称为功能性踝关节不稳（FAI）的慢性疾病。关于踝关节跖屈肌和背屈肌等速运动测量的研究报道有限。
在踝关节稳定的参与者和功能性不稳定的参与者中，检查踝关节在发生内翻、外翻、跖屈和背屈时肌肉组织的等速离心扭矩测量值。
病例对照研究。
运动训练研究实验室。
FAI组纳入了20名有“打软腿”病史的参与者。FAI组的纳入标准包括至少有1次踝关节扭伤病史和反复出现打软腿情况。对照组纳入了20名既往无踝关节损伤史的参与者。
对每位参与者进行等速离心扭矩评估。
对踝关节内翻-外翻和跖屈-背屈运动进行等速离心测试。峰值扭矩值根据每位参与者的体重进行标准化。每个方向3次试验的平均值用于统计分析。
在离心跖屈扭矩方面发现了显著的组间交互作用（P < 0.01）。后续的t检验显示，FAI组中FAI侧下肢与对照组中匹配侧下肢之间存在显著差异。此外，对照组两侧之间也存在显著差异（P = 0.03）。在离心内翻、外翻或背屈扭矩方面未发现显著的交互作用（P > 0.05）。
在功能性不稳定的踝关节中发现了跖屈扭矩不足。在内翻、外翻或背屈扭矩方面未发现不足。因此，离心跖屈力量可能是导致功能性踝关节不稳的一个重要因素。
