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Updated: Jun 4, 2026
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Spinal Sonography for Ultrasound-Guided Lumbar Neuraxial Anesthesia
Published on: January 31, 2025
Evaluating infant positioning for lumbar puncture using sonographic measurements.
Beth A Cadigan1, Rita K Cydulka, Sandra L Werner
1Department of Emergency Medicine, MetroHealth Medical Center, Case Western Reserve University, Cleveland, OH, USA. cadigab@mail.amc.edu
Summary
Tight infant positioning for lumbar puncture increases lumbar interspinous spaces. However, a neutral spine position also provides adequate space, warranting further clinical research for its feasibility.
Area of Science:
- Pediatric Medicine
- Medical Imaging
- Anatomy
Background:
- Hypoxia is a risk during infant lumbar puncture in a flexed lateral position.
- Sonographic measurement can assess lumbar interspinous spaces.
Purpose of the Study:
- To investigate the anatomical necessity and benefits of tight, flexed positioning for infant lumbar puncture.
- To evaluate lumbar interspinous spaces using sonography.
Main Methods:
- Prospective observational study of 21 healthy infants (<1 month old).
- Sonographic measurement of lumbar interspinous distances in neutral and flexed positions.
- Pulse oximetry monitoring during flexed positioning.
Main Results:
- In neutral position, interspinous spaces (L3-4, L4-5, L5-S1) exceeded the diameter of a 22-gauge spinal needle.
- Flexed positioning increased interspinous spaces by 31% (L3-4), 51% (L4-5), and 44% (L5-S1).
Conclusions:
- Tight, flexed positioning significantly enhances lumbar interspinous space.
- A neutral spine position offers anatomically sufficient space for lumbar puncture.
- Further clinical research is needed to confirm the feasibility of lumbar puncture in a neutral spine position.
