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Ultrasonographic Findings of the Ulnar Nerves in Cubital Tunnel Syndrome |
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Young Hwan Koh, MD Jee Won Chai, MD, Se-Yeong Chung, MD, Young Ho Choi, MD, Joo Hee Cha, MD |
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1Department of Radiology, Seoul Municipal Boramae Hospital |
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Purpose: To determine useful diagnostic criteria of cubital tunnel syndrome (CTS),
using ultrasonographic ulnar nerve cross-sectional areas (UNCSA) measurements.
Materials and Methods: The CTS group included 28 patients confirmed with nerve
conduction study and the control group included 17 healthy adults. Ulnar nerve crosssectional
areas (UNCSA) were measured at the distal 1/3 upper arm level and in the
cubital tunnel (CTN). US findings of CTS were ulnar nerve dislocation (n = 2), ulnar
nerve subluxation (n = 5), ganglion (n = 1), sever elbow joint osteoarthritis (n = 1) and
elbow joint valgus deformity after fracture (n = 1). UNCSA, the ratio of UNCSA in CTN
to distal 1/3 upper arm level (CH ratio), and the difference of UNCSA between CTN
and distal 1/3 upper arm level (CH difference) were evaluated to obtain the optimal
diagnostic cutoff value of CTS, using ROC curve.
Results: The mean UNCSA in CTN was 0.168 cm2 in the CTS and 0.067 cm2 in the
control. The CTS could be diagnosed when UNCSA, the CH ratio and the CH difference
are larger than 0.096 cm2, 1.371 and 0.036 cm2 respectively. The ROC curve
area was largest and the sensitivity, specificity was respectively 82.4%, 95.8%, when
the CH difference was used as cutoff value.
Conclusions: Ultrasound is useful for the detection of CTS pathogenic lesions in
CTN. The highest diagnostic accuracy was acquired when the CH difference is larger
than 0.036 cm2. |
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Keyword : Cubital tunnel syndrome; Ulnar nerve; Ultrasound (US); Diagnosis |
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pdf파일 : 119-124고영환.pdf
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