SDMS CME Credit – Sonographic Reference Values for Median Nerve Cross-sectional Area: A Meta-analysis of Data From Healthy Individuals

SDMS members can earn SDMS CME credit by successfully completing the complimentary online CME test in the SDMS Learning Center at learn.sdms.org. Non-members may access the online CME test for a fee. Note: questions may appear in random order online.

Authors: Shawn C. Roll, PhD, OTR/L, RMSKS, FAOTA, FAIUM, Sandy C. Takata, PhD, OTD, OTR/L, Buwen Yao, PhD, MBBS, Lynn Kysh, MLIS, MPP, and Wendy J. Mack, PhD

Category: Musculoskeletal [MSK]

Credit: 1.00 SDMS CME Credit

Objectives: After studying the article, you should be able to:

• Identify the role of sonography in the evaluation of peripheral nerves.

• Describe the anatomic regions of the median nerve.

• Recognize the utility of sonography in the evaluation of the median nerve.

1. What is the false positive rate for sonography in evaluating the median nerve?

2. B. 17%

3. C. 23%

4. D. 32%

Data from how many articles were included in this meta-analysis?

A. 56

B. 73

C. 97

D. 112

What was the median age of the healthy participants in the sample?

A. 43.6

B. 45.7

C. 53.2

D. 61.8

What was the cross-sectional area (CSA) of the median nerve in the upper arm, elbow, and wrist?

A. 3-4mm²

B. 5-6mm²

C. 7-8mm²

D. 8-9mm²

What should the CSA of a healthy median nerve be in the proximal carpal tunnel?

A. 8.60mm²

B. 9.7mm²

C. 10.1mm²

D. 11.9mm²

What is the reference value for the most common measurement site within the carpal tunnel at the level of the pisiform?

A. 8.60mm²

B. 9.7mm²

C. 10.1mm²

D. 11.9mm²

What is the difference in the CSA of the median nerve between the dominant and non-dominant wrists?

A. 10%

B. 12%

C. 15%

D. No difference