The lumbar spinous processes are broad, horizontally projecting posterior bony projections of L1-L5, providing attachment for the supraspinous and interspinous ligaments, erector spinae aponeurosis, and multifidus. They are the largest spinous processes in the spine and are easily palpable in the lumbar midline, serving as the primary landmarks for spinal level identification.
The L4 spinous process is at the level of the iliac crest intercristal line, the primary landmark for lumbar puncture, epidural injection, and spinal level identification. Kissing spine (Baastrup disease) is impaction of adjacent lumbar spinous processes in hyperlordosis, causing midline pain. Spinous process fractures from avulsion (clay-shoveller equivalent) or direct trauma are typically managed conservatively. Percutaneous interspinous process devices (X-Stop) are placed between adjacent processes for lumbar spinal stenosis.
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