Frequency Analysis of Surface EMG on Knee Extensors in Cases with ACL Insufficiency. Per- and Post-operative Comparison.:Per- and Post-operative Comparison

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Six cases (4 males, 2 females) with ACL insufficiency were evaluated by frequency analysis of surface EMG preoperatively and at 4 or 6 months after surgery. Patients ranged in age from 17 to 41 years (mean 27 years). The surface EMG was recorded from above the quadriceps muscle during sustained (30 sec.) isometric contraction. The recorded EMG was computerized by spectrum analyzer. Results were as follows. Mean power frequency showed a more sudden decrease post-operatively compared to per-operative values. In other words, the higher (>81Hz) frequency zone was increased post-operatively compared with pre-operation. We concluded that type II fibres on knee extensors were actived by reconstrution and rehabilitation.
西日本整形・災害外科学会の論文