Efficacy of Ultrasound-Guided Needle Knife Release for Trigger Finger

This is a clinical trial designed to investigate the efficacy and safety of ultrasound-guided tri-directional needle knife release in patients with trigger finger, especially those patients for whom conservative treatments have failed. Trigger finger is caused by of thickening of the A1 pulley, leading to pain and stiffness, which results in limitation of the hand. The procedure will be carried out under local anesthesia and guided by ultrasound to be very accurate and safe, avoiding all possible risks. Patients will be assessed for better improvement in hand functioning, pain scale basing on visual analog scale, and above all patient overall satisfaction.