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![The difference of intraoperative free-run electromyography monitoring between percutaneous endoscopic lumbar discectomy via a transforaminal and via an interlaminal](https://image.oaes.cc/d48bfa19-4f98-4836-9023-3786148db542/3236.fig.1.jpg)
Figure 1. Train wave of free-run electromyogram. This wave was observed in TF-PELD at L4-L5 case when the sleeve was manipulated hand-down. Same waves were also observed in IL-PELD at L5-S1. TF-PELD: transforaminal percutaneous endoscopic lumbar discectomy; IL: interlaminar