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DOI:10.2214/AJR.05.0764
AJR 2007; 188:198-202
© American Roentgen Ray Society

Clinical Observations

Extensor Retinaculum of the Wrist: Sonographic Characterization and Pseudotenosynovitis Appearance

Brian L. Robertson1, David A. Jamadar1, Jon A. Jacobson1, Monica Kalume-Brigido1, Elaine M. Caoili1, Zvi Margaliot2 and Michel O. De Maeseneer1,3

1 Department of Radiology, University of Michigan Hospitals, 1500 E Medical Center Dr., TC2910, Ann Arbor, MI 48109.
2 Division of Plastic Surgery, Department of Surgery, Trillium Health Centre, Mississauga, ON, Canada.
3 Present address: Division of Radiologic Sciences, Wake Forest University, Winston-Salem, NC 27157-1088.

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.

Keywords: anatomy • hand • sonography • tenosynovitis • wrist


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