Anatomic Landmarks to Locate the Median Nerve for Safe Wrist Block or Carpal Tunnel Steroid Injection

Ron Brooks, MD; Amanda Kistler, MD; Saeed Chowdhry, MD; Andrew Swiergosz, BS; Katharina Perlin, BS; Morton L. Kasdan, MD; Bradon J. Wilhelmi, MD

Disclosures

ePlasty. 2019;19(e19) 

In This Article

Results

All of the measurements were taken at the level of the radial tip of the interstyloid line. In the 7 dissections, the mean diameter of the MN was 7.85 mm ± 1.8 mm and the distance from the ulnar edge of the MN to the midpoint of the wrist and also the PL tendon was 3.17 mm ± 0.75 mm and 3 mm ± 0.89 mm, respectively. The distance from the ulnar edge of the MN to the ulnar edge of the FCR tendon was 9.57 mm ± 2 mm. These measurements suggest that the MN lies slightly ulnar to the PL tendon and the midpoint of the wrist at the level of the radial tip of the interstyloid line. As a result of these measurements, we propose that the injections be placed just ulnar to the FCR tendon or 8 to 10 mm radial to the midpoint of the wrist to avoid inadvertent direct MN injection and injury.

Comments

3090D553-9492-4563-8681-AD288FA52ACE

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