Related Experiment Video
Updated: Jul 18, 2026

Measurement of Healthy and Injured Triceps Surae Morphology
Published on: October 27, 2023
Extensor retinaculum of the wrist: sonographic characterization and pseudotenosynovitis appearance
Brian L Robertson1, David A Jamadar, Jon A Jacobson
1Department of Radiology, University of Michigan Hospitals, 1500 E Medical Center Dr., TC2910, Ann Arbor, MI 48109, USA.
Objective:
We have found in our practice that the normal extensor retinaculum of the wrist may appear hypoechoic on sonography and, because it is closely applied to the extensor tendons, may simulate tenosynovitis. This study prospectively evaluates the extensor retinaculum in 50 healthy adult volunteers, characterizing its sonographic appearance.
Conclusion:
The extensor retinaculum has a characteristic appearance on sonography. A hypoechoic appearance from anisotropy should not be confused with tenosynovitis.
Related Concept Videos
Muscles of the Forearm that Move the Hand and Fingers
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...
Ultrasonography
During an ultrasonography procedure, a handheld device called a...
