الفهرس 
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Abstract
Carpal tunnel syndrome (CTS) is the most common entrapment neuropathy, with the prevalence of 50 cases per 100 subjects in the general population, 9.2% in women and 6% in men (Mondelli et al., 2002).
Carpal tunnel syndrome (CTS) is caused by localized compression and entrapment of the median nerve at the wrist within the carpal tunnel positioned between the transverse carpal ligament and the carpal bone. It causes sensory (paresthesia and hypoesthesia), motor deficit, and pain especially at night within the median nerve distribution in the hand that are secondary to the mechanical compression and local ischemia (Marshall, 2001, Mondelli et al., 2002 and Bongi et al., 2013).
Many patients with CTS have self-limiting symptoms and respond to non-operative conservative treatments; local corticosteroid injection is used in conservative treatment where its anti-inflammatory therapeutic effect is helpful in relieving the inflammatory process occurring in carpal tunnel syndrome. Steroid injection could be carried out using anatomical landmarks, or using ultrasonographic guidance.
The aim of our study is to compare the outcome of ultrasound guided injection Vs blinded injection for carpal tunnel syndrome patients regarding clinical, NCS and ultrasound imaging to enhance the results of injection for those patients.
Our study included 30 patients; they were randomly assigned to 2 groups. group I consists of 15 patients injected with ultrasound guidance and group II consists of 15 patients injected blindly depending on the anatomical landmarks Patients were included in our study according to electro-physiological findings and subjected to medical history, clinical examination, Boston Carpal Tunnel Questionnaire (BCTQ) (SSS and FSS), Nerve conduction study and Musculoskeletal-ultrasonographic imaging (CSA and FSS). All patients are subjected to injection in our study.
Both groups received local injection with one needle two syringe technique the first was performed containing 0.5 ml of lidocaine 1% followed by injection with 0.5 ml of steroid 40 mg triamcinolone.
After 4 weeks of injection symptoms and functions were re-evaluated using Boston Carpal Tunnel Questionnaire (BCTQ) (SSS and FSS), Nerve conduction studies and Musculoskeletal-ultrasonographic imaging (CSA and FR).
There is significant improvement of the outcomes in the 2 groups as regard Boston Carpal Tunnel Questionnaire (BCTQ) (SSS and FSS), Nerve conduction studies and Musculoskeletal-ultrasonographic imaging (CSA and FR) where patients injected under ultrasound guidance shows better outcomes.