Objectives. Local corticosteroid injection is an effective method in the treatment of trigger finger. In recent years, ultrasound-guided corticosteroid injection is a new technique but not yet evaluated in Vietnam. This study was to (1) compare the effetiveness of the clalssical and ultrasound-guided corticosteroid injection techniques for trigger finger. Subjects and Methods. This prospective, descriptive, cross sectional study was carried out on 95 patients, diagnosed with trigger finger according to the Green DP - 2005 criteria. The patients were divided into two groups, including 50 consecutive patients with 60 trigger digits treated with blind corticosteroid injection, and 45 others with 54 trigger digits treated with ultrasound-guided corticosteroid injection into the first annular (A1) pulley. Results. The thumb was most commonly affected (66.7 percent). The most frequent clinical symptoms and signs were pain with triggering (42.3 percent), trigger finger (77.2 percent) and tendon nodules (59.6 percent). The grade II lesion, according to Green DP - 2005 criteria, accounted for 46.5 percent. The mean thickness of abnormal tendons was 3.74 + or - 0.07 mm. Diffuse thickening and hypoechogenidty of the flexor tendons were observed in 80.7 percent cases. The success rates of ultrasound-guicled corticosteroid injection technique were 100 percent for grade I, 56.5 percent for grade II and 50.0 percent for grade III; whereas the success rates of classical corticosteroid injection technique were 100 percent, 42 percent and 38.5 percent, respectively. Conclusion: Ultrasound - guided corticosteroid injection technique was more effective than the blind injection in treatment of trigger finger.
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