Figure 4From: Abdominal circumference but not the degree of lumbar flexion affects the accuracy of lumbar interspace identification by Tuffier’s line palpation method: an observational studyTuffier’s line intersecting with spine. The distribution of Tuffier’s line intersecting with the spine in the supine position under X-ray (■), hyperflexion position under X-ray () and the estimated level under hyperflexion by palpation (□).Back to article page