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Diagnostic value of ultrasonography using median nerve-tunnel index in patients with carpal tunnel syndrome
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| Alieh Rezazadeh, Amir Hoshang Bakhtiary *, Afshin Samaei, Jamileh Moghimi, Raheb Ghorbani |
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Abstract: (5753 Views) |
| Introduction:This study aimed to evaluate the diagnostic value of ultrasonographic median
nerve cross-sectional area and median nerve-tunnel indices comparing to nerve
conduction study (NCS) test in patients with carpal tunnel syndrome (CTS). Materials and Methods: eventy-one hand with clinical symptoms of CTS and fifty-five healthy hands
were participated in the study. The cross sectional areas of the median nerve and
carpal tunnel in proximal and distal of carpal tunnel were obtained by ultra sonography.
The proximal and distal nerve/tunnel indices were obtained by calculating the
ratio between the proximal and distal cross-sectional areas of the median nerve
to those of the carpal tunnel. Results: The mean of nerve-tunnel index in the distal and proximal
were significantly different between patients with CTS and normal (p>0.001).
The study showed no difference between the proximal and distal nerve/tunnel
index and also between nerve-tunnel Index and median nerve cross-sectional
area. Designated cut-off points of proximal nerve-tunnel index for mild,
moderate and severe CTS was determined at 6.34, 6.36 and 6.76 with a diagnostic sensitivity of 47.4, 75.8
and 85.7%, respectively, while the
cut-off point of distal nerve-tunnel Index was 6.58, 6.58 and 7.61with a
diagnostic sensitivity of 47.4, 67.6 and 78.6% , respectively. Conclusion: The results showed that the nerve/tunnel index is not a reasonable replace
for NCS technique, due to its low sensitivity and specificity, especially in
mild cases. Also, our study showed no significant difference between using
ultra sonography nerve-tunnel index and median nerve cross-sectional area in
the diagnosis of CTS. |
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| Keywords: Carpal tunnel syndrome, Median nerve, Ultra sonography |
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Full-Text [PDF 245 kb]
(1165 Downloads)
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Type of Study: Research |
Subject:
General
Received: 2013/11/28 | Accepted: 2014/04/13 | Published: 2014/06/11
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