Abdel-aziem Amr Almaz, Draz Amira Hussin
Department of Biomechanics, Faculty of Physical Therapy, Cairo University, Giza, Egypt.
Department of Basic Sciences, Faculty of Physical Therapy, Cairo University, Giza, Egypt.
J Back Musculoskelet Rehabil. 2014;27(1):47-53. doi: 10.3233/BMR-130418.
To determine if the eccentric evertor/invertor and dorsiflexor/plantar-flexor ratio are altered in subjects with chronic ankle instability.
Twenty chronic ankle instability (CAI) subjects as an experimental group, and twenty healthy subjects as a control group, were matched in age, gender, and activity level. CAI subjects have a history of at least one ankle sprain and repeated episodes of giving way were included in CAI group. Subjects with no prior history of ankle injury were included in the control group. Ankle evertor/invertor and dorsiflexor/plantar-flexor muscles eccentric torque ratios were measured using the eccentric muscle contraction at angular velocities 60 and 120°/s.
Analysis of variance revealed that the eccentric contraction eversion/inversion ratio of CAI group was significantly lower than normal group ratio at angular velocities 60 and 120°/s (p=0.041 and 0.012) respectively. The eccentric contraction dorsiflexion/plantarflexion ratio of CAI group was significantly higher than normal group ratio at both angular velocities (p=0.036 and 0.013) respectively. Moreover, at angular velocities of 60°/s and 120°/s a deficit in inversion and eversion eccentric torques were identified in CAI group (p=0.000), plantarflexion torque deficit of CAI group (p=0.034 and 0.028), respectively, and no deficit was identified for dorsiflexion torque of CAI group (p=0.595 and 0.696) respectively.
Chronic ankle instability increases the dorsiflexion/plantarflexion muscles torque ratio and decreases the eversion/inversion ratio at angular velocities 60 and 120°/s. Therefore, the restoration of a normal eccentric inversion, eversion, and plantarflexion strength may prevent recurrent lateral ankle ligament sprain.
确定慢性踝关节不稳患者的离心性外翻/内翻肌与背屈/跖屈肌比率是否发生改变。
20名慢性踝关节不稳（CAI）患者作为实验组，20名健康受试者作为对照组，两组在年龄、性别和活动水平上进行匹配。CAI组患者有至少一次踝关节扭伤史且反复出现打软腿情况。对照组纳入无踝关节损伤既往史的受试者。使用角速度为60和120°/秒的离心肌肉收缩来测量踝关节外翻/内翻肌和背屈/跖屈肌的离心扭矩比率。
方差分析显示，CAI组在角速度60和120°/秒时的离心收缩外翻/内翻比率分别显著低于正常组比率（p = 0.041和0.012）。CAI组在两个角速度下的离心收缩背屈/跖屈比率均显著高于正常组比率（p = 0.036和0.013）。此外，在60°/秒和120°/秒角速度下，CAI组的内翻和外翻离心扭矩存在不足（p = 0.000），CAI组的跖屈扭矩不足分别为（p = 0.034和0.028），而CAI组的背屈扭矩未发现不足（p = 0.595和0.696）。
慢性踝关节不稳会增加背屈/跖屈肌扭矩比率，并在角速度60和120°/秒时降低外翻/内翻比率。因此，恢复正常的离心性内翻、外翻和跖屈力量可能预防复发性外侧踝关节韧带扭伤。
