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Table 3 Anterior 1/3 of psoas thickness (APT) according to lumbar levels (mm)

From: Neutral hip position for the oblique lumbar interbody fusion (OLIF) approach increases the retroperitoneal oblique corridor

  APTS APTHF APTHN
L2/3 14.9 ± 2.1 15.9 ± 3.7 13.6 ± 4.3
L3/4 23.2 ± 4.8 23.8 ± 4.9 20.2 ± 5.9*
L4/5 30.9 ± 7.2 32.2 ± 2.1 28.4 ± 2.7*
  1. * indicates p < 0.05
  2. APTS anterior 1/3 of psoas thickness in supine
  3. APTHF anterior 1/3 of psoas thickness in right lateral decubitus with hip flexion
  4. APTHN anterior 1/3 of psoas thickness in right lateral decubitus with hip in neutral
  5. There were statistical differences between APTHN compared to the APTS and APTHF at L3/4 and L4/5 (p < 0.05).