The surface anatomy of the lumbar region is the basis for determining the vertebral level. Key anatomical landmarks include the iliac crest, spinous processes, the sacrum and the posterior superior iliac spines (PSISs).
• The tops of the iliac crest lie at the level of the L4-L5 interspace (or the L4 spinous process).
line projected froiri tops of iliac crests usually bisects
L4—LS interspace p&SteriOr-superior iliac spine
Fig. 33.4 Surface anatomy and important landmarks of the lumbosacral spine
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