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  • Title: Electromyographic analysis of anterior cruciate deficient knees with and without functional bracing during lunge exercise.
    Author: Jalali M, Farahmand F, Rezaeian T, Ramsey DK, Mousavi SM.
    Journal: Prosthet Orthot Int; 2016 Apr; 40(2):270-6. PubMed ID: 25519297.
    Abstract:
    BACKGROUND: The use of functional knee braces for returning to sports or during demanding activities following anterior cruciate ligament rupture is common; yet despite being commonly prescribed, its mechanism of action remains unknown. OBJECTIVES: To examine the effect of functional knee braces on mean muscle activity when performing lunge exercises. STUDY DESIGN: Pre-/post-test (within-subject research design). METHODS: A total of 10 male participants with unilateral isolated anterior cruciate ligament deficiency participated. Electromyographic activities of six muscles around the knee were recorded during lunge exercises, with and without wearing a custom functional knee brace. The lunge cycle movement was subdivided into three phases: eccentric, isometric, and concentric. RESULTS: The quadriceps and hamstrings were no different in the braced and unbraced conditions. When braced, the mean amplitude of the medial gastrocnemius was significantly lower throughout the whole movement (p = 0.01) and during the concentric (p = 0.006) and eccentric (p = 0.028) phases, but not within the isometric phase. The lateral gastrocnemius was found to have lower mean amplitude in the isometric phase (p = 0.044). CONCLUSION: With its origin on the medial femoral condyle, perhaps reduced medial gastrocnemius activity may better guide knee rotation and assist the joint achieving a healthier kinematic pattern. CLINICAL RELEVANCE: Lower medial gastrocnemius activity may facilitate lower medial compartment contact pressure, for which greater loading is known to increase the risk of osteoarthritis in anterior cruciate ligament-deficient (ACLD) knees. However, further research is needed.
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