Fig. 10From: Kambin's triangle-related data based on magnetic resonance neurography and its role in percutaneous transforaminal endoscopic lumbar interbody fusionRatio of the length of the upper half part of the anatomic mark line to the total length at each segment of the lumbar intervertebral space of L1–L5. With “a” representing the comparison between the two groups (P < 0.05, P > 0.001)Back to article page