Effects of functional knee bracing on muscle-firing patterns about the chronic anterior cruciate ligament-deficient knee.

Abstract:

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.

journal_name

Arch Phys Med Rehabil

authors

Smith J,Malanga GA,Yu B,An KN

doi

10.1053/s0003-9993(03)00280-6

subject

Has Abstract

pub_date

2003-11-01 00:00:00

pages

1680-6

issue

11

eissn

0003-9993

issn

1532-821X

pii

S0003-9993(03)00280-6

journal_volume

84

pub_type

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