Fig. 1From: Neutral hip position for the oblique lumbar interbody fusion (OLIF) approach increases the retroperitoneal oblique corridorThe retroperitoneal oblique corridor (ROC) measured in the three different positions; supine position: ROCS a, the right lateral decubitus with the left hip in flexion: ROCHF b, and the right lateral decubitus with the left hip neutral: ROCHN c. Noted the differences in left psoas morphologies and thicknessBack to article page