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Journal of the Korean Academy of Rehabilitation Medicine 2009;33(5):627-631.
Feasibility of Ultrasonographic Area Ratio of Median Nerve in the Diagnosis of Carpal Tunnel Syndrome in Korea.
Cho, Jung Mo , Yoon, Joon Shik , Kim, Sei Joo , Park, Byung Kyu , Lee, Gyu Ho , Jeong, Jin Seok
Departement of Rehabilitation Medicine, Korea University College of Medicine, Korea. rehab46@korea.ac.kr
한국인의 수근관 증후군에서 정중신경 단면적 비의 유용성
조정모, 윤준식, 김세주, 박병규, 이규호, 정진석
고려대학교 의과대학 재활의학교실
To examine the usefulness of ratio of maximal swelling to normal cross sectional area (CSA) of median nerve with ultrasound in patients with carpal tunnel syndrome (CTS) and healthy controls.
Patients with electrodiagnostically proven CTS underwent ultrasonography of the median nerve. The median nerve area was measured at three points (maximal swelling site, 2 cm proximal to maximal swelling site, 12 cm proximal to maximal swelling site) and compared to values from asymptomatic volunteers.
The ratio of maximal swelling site to 12 cm proximal was 1.34±0.14 in asymptomatic volunteers and 2.31±0.43 in patients presenting with CTS. The ratio of maximal swelling site to 12 cm proximal gave 73.7% sensitivity and 90.0% specificity. While using only median nerve area at the wrist resulted in 81.6% sensitivity and 70.0% specificity, depending on the cutoff value used.
The ratio of maximal swelling site to proximal in patients with CTS is elevated as compared to asymptomatic controls. The ratio of maximal swelling site to 12 cm proximal has higher specificity to diagnose CTS, and may be superior to measuring median nerve area at the wrist alone. (J Korean Acad Rehab Med 2009; 33: 627-631)
Key Words: Carpal tunnel syndrome, Ultrasonography, Area ratio


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