Local infiltration of corticosteroids easily leads to atrophy of the median nerve, subcutaneous fat, and systematic complications, surgical treatment decision is always taken by the patient who sometimes wants to delay or avoid the surgery because of psychological or medical concerns, It would be interesting if low molecular weight sodium hyaluorinate injection is used as an alternative conservative treatment of CTS. This study aims to investigate if, and to what extent, hydro-dissection using 1% lidocain followed by injection of Sodium hyaluronate versus 1% lidocain followed by injection of 40 mg of triamcinolone acetonide, under ultrasound guidance.