TY - JOUR
A1 - El Hewala, Abd El Samad
A1 - Nageeb, Ghada
A1 - Fouad, Sara
A1 - Shawky, Khaled
T1 - Intranerve ratio and ultrasonography reliability in increasing the diagnostic sensitivity of minimal ulnar nerve entrapment at the elbow
Y1 - 2013/4/1
JF - Egyptian Rheumatology and Rehabilitation
JO - Egypt Rheumatol Rehabil
SP - 107
EP - 113
VL - 40
IS - 2
UR - http://www.err.eg.net/article.asp?issn=1110-161X;year=2013;volume=40;issue=2;spage=107;epage=113;aulast=El
N2 - Objective
The aim of this study was to detect the role of intranerve ratio (IN-ratio) and high-resolution ultrasonography (HRUS) in increasing the diagnostic sensitivity of minimal ulnar nerve entrapment (UNE) at the elbow.
Methods
This study included 39 patients having clinical and electrophysiological evidence of UNE, 27 patients having only clinical evidence of UNE, and 28 apparently healthy volunteers. IN-ratios were calculated and HRUS of the ulnar nerve were performed for all individuals.
Results
The IN-ratio was significantly decreased in group II when compared with other groups. The cutoff value was 0.98 or less for IN-ratio and 10mm 2 or more for maximum crosssectional area (CSA-max). In group II, the CSA-max values were significantly increased in patients with positive IN-ratios (≤ 0.98) compared with those with negative IN-ratios
(40.98). There was a significant negative correlation between IN-ratios and CSA-max values. Positive decreased IN-ratios (≤0.98) were detected in 26 patients. IN-ratios of 0.98 or less were more frequently observed in patients of group II compared with other groups. Moreover, a higher incidence of positive IN-ratios (≤0.98) along with positive
CSA-max (≥10mm 2 ) values was observed among patients of group II compared with other groups. Sensitivity and specificity of IN-ratios in diagnosing UNE electrophysiological (UNE EF)- patients were 66 and 82%, respectively. Using both IN-ratios (≤0.98) and CSA-max (≥10mm 2 ) increased the diagnostic sensitivity and specificity of UNE to 85 and 94%, respectively.
Conclusion
When IN-ratio and HRUS (CSA-max) findings are positive, the patient could be classified as having 'minimal UNE'. Recommendation Using this new electrophysiological test along with CSA-max as a routine screening
test for minimal cases of UNE is beneficial.
ER -