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KMID : 0948920220210010032
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Clinical Pain
2022 Volume.21 No. 1 p.32 ~ p.37
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Relationship between Anconeus Epitrochlearis and Ulnar Motor Nerve Conduction Velocity
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Lim Dong-In
Seo Min-Su
Hwang Seok-Joon
Lee Ho-Jun
Park Jin-Woo
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Abstract
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Objective: To determine the incidence of anconeus epitrochlearis (AE) muscle and evaluate the correlation between AE muscle and ulnar motor nerve conduction velocity (NCV).
Method: Forty healthy volunteers (80 arms) were evaluated. Ulnar motor nerve conduction study was performed. NCVs at the forearm and across the elbow were calculated. Ultrasonography (US) was used to obtain a transverse scan view of the cubital tunnel and confirm the presence of the AE muscle. Cross-sectional areas (CSAs) of following structures were obtained: ulnar nerve (UNCSA), cubital tunnel (CTCSA), and AE (AECSA). AECSA was divided by CTCSA to obtain the AE/CT ratio. Pearson correlation coefficient (PCC) was calculated to evaluate the relationship between NCV across elbow and each variable obtained by US.
Results: Sixty-three (78.75%) of eighty arms showed the presence of AE muscle. NCV had no significant correlations with sonographic variables. However, when 17 arms with a relatively low NCV value (≤ 60 m/s) were analyzed, NCV showed significant correlations with AECSA (PCC: r = ?0.674, p=0.003) and AE/CT ratio (PCC: r = ?0.516, p=0.034).
Conclusion: When all 63 cases with AE muscle were analyzed, ulnar NCV showed no significant correlations with sonographic variables. However, when those with NCV value of 60 m/s or less were analyzed, NCV showed significant negative correlations with AECSA and AE/CT ratio.
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KEYWORD
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Ulnar nerve, Anatomic variation, Ultrasonography, Ulnar nerve compression syndrome, Correlation study
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