Predictive Scoring and Risk Factors of Early Recurrence after Percutaneous Endoscopic Lumbar Discectomy

Figure 1

Transforaminal Inside-out and Outside-in technique. The technique of endoscopic transforaminal approach can be divided into the inside-out or outside-in techniques, based on the sequence method of whether the working channel was inserted into the disc space first (a) and then approaches the epidural space (out of disc space) later or in a reverse order (b).

(a)

(b)