Effects of functional knee bracing on muscle-firing patterns about the chronic anterior cruciate ligament-deficient knee.
Effects of functional knee bracing on muscle-firing patterns about the chronic anterior cruciate ligament-deficient knee.
复制标题
功能性膝关节支撑对慢性前十字韧带缺陷膝关节肌肉发射模式的影响。
DOI：
10.1053/s0003-9993(03)00280-6
复制
发表时间：
2003
影响因子：
4.3
通讯作者：
K. An
中科院分区：
文献类型：
--
作者：
Jay Smith;G. Malanga;Bing Yu;K. An
客观的
OBJECTIVE
To examine the effects of functional knee bracing on the muscle-firing patterns about the chronic anterior cruciate ligament (ACL)-deficient knee in successful brace users.
DESIGN
Cross-sectional comparative clinical trial.
SETTING
Motion analysis laboratory.
PARTICIPANTS
Ten active individuals with unilateral, isolated, chronic (>18mo postinjury), ACL-deficient knees who subjectively reported improved function with a functional knee bracing.
INTERVENTION
Each subject completed 3 single-leg hop maneuvers on their ACL-deficient knee with and without their knee brace while surface electromyographic activity was recorded from the quadriceps, hamstring, and gastrocnemius muscles.
MAIN OUTCOME MEASURES
Muscle onset latency.
RESULTS
Brace use significantly delayed the average onset of vastus lateralis activation before landing (123+/-47ms vs 109+/-30ms, P<.001), though significant interindividual variations existed. Bracing significantly altered the onset latency in 1 or more muscles in 9 of 10 subjects. In 4 subjects, a favorable change in the firing pattern was seen, whereas only 1 subject exhibited an unfavorable change. Without bracing, 5 of the 10 subjects fired the hamstrings or gastrocnemius muscles first; with bracing, 7 of 10 fired these muscles first.
CONCLUSIONS
Brace use in this population did not consistently result in more favorable muscle firing patterns during the single-leg hop maneuver. Interindividual responses to brace use indicate the need for further research to investigate the multiple strategies that may exist to stabilize the ACL-deficient knee. In the meantime, functional knee brace use among ACL-deficient patients remains empirical.