الفهرس 
INTRODUCTION AND RATIONALEOnly 14 pages are availabe for public view
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Abstract
Ulnar nerve entrapment at the elbow is the second most common entrapment neuropathy after the median nerve entrapment at the wrist. It is a relatively common clinical syndrome which refers to entrapment of the ulnar nerve at the elbow within the cubital groove, characterized by neurologic manifestations and may be caused by various conditions including mechanical or dynamic compression of the ulnar nerve at elbow, friction or traction of the nerve (Beekman et al., 2004).
It is usually diagnosed with nerve conduction studies and electromyography. However, these studies are painful, invasive and uncomfortable. In addition, nerve conduction studies fail to localize and diagnose ulnar nerve lesions with purely sensory fibers involved or lesion with selective fascicular involvement. Also, ulnar nerve displacement at the elbow could cause errors in distance measurement and also overestimation of nerve conduction velocity which would lead to false- negative diagnosis (Bayrak et al., 2007).
High-resolution ultrasonography is a rapidly developing technique that is gaining popularity for the evaluation of the ulnar nerve through assessing the nerve shape, echogenicity and the appearances of the surrounding anatomy (Martinoli et al., 2004). Moreover, HRUS is also able to image parts in dynamic motion, which may not be feasible for conventional MRI or CT. Therefore, HRUS measurements offer potential quantitative tools for the diagnosis of UNE (Ginn et al., 2007).