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KMID : 0860920040060010045
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Journal of the Korean Association EMG-Electrodiagnostic Medicine
2004 Volume.6 No. 1 p.45 ~ p.51
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Dynamic Electromyographic Activities of Lower Extremity Muscles in Patients with Osteoarthritis of the Knees
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Lim Kil-Byung
Lee Hong-Jae
Joo Sung-Joo
Chai Ji-Won
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Abstract
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Objective: To investigate the characteristics of electromyographic actividuals with knee osteoarthritis using dynamic eletromyography (dEMG)
Method: dEMG activites of eight muscle of lower extremities in 15 patients and 16 healthy controls were measured during walking. dEMG activities were divided according ro four phases of a gait cycle (phade 1, heel strike - foot flat; phase 2, foot flat - toe off; phase 3, toe off midswinig; phase 4, midswinig - terminal swing). Duration of each phase to duration of one gait cycle (%) and normalized integrated electromyography (NIEMG)of each muscle (%) were compared between patients and controls.
Results: Patients showed longer duration of phase 2 and shorter duration of phase 3 than controls (p<0.05). The NIEMGs of vastus medialis and those of peroneus longus during phase 1 were smaller and larger, respectively. in patients than in controls (p<0.05). The NIEMGs of tibialis anterior during phase 3 and thos of medial gastrocnemius during phase 4 were larger and smaller, respectively, in patients than in controls (p<0.05).
Conclusion:Duration of gait cycle and dEMG activities of the lower extremities of the individuals with knee osteoarthritis were different from those of healthy sybjects.
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KEYWORD
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Knee osteoarthritis, Dynamic EMG, Gait
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