The effect of early intervention of mirror visual feedback on pain, disability and motor function following hand reconstructive surgery: a randomized clinical trial

Objective: To determine the effect of mirror visual feedback (MVF) on disability, pain, and motor function on patients who underwent hand reconstructive surgery. Design: Randomized, single-blinded controlled trial. Setting: Rehabilitation center. Subjects: A total of 40 patients who were randomly assigned into the intervention group ( n = 20) and control group ( n = 20) participated in this study. Interventions: The rehabilitation sessions took place twice a week for eight weeks. The control group received traditional rehabilitation for 75 minutes. While the intervention group performed MVF and traditional rehabilitation for 30 and 45 minutes, respectively. Measures: Pain and disability of the hand were assessed with McGill pain questionnaire and Disability of Arm, Shoulder, and Hand (DASH) scores. The range of joint motion was evaluated by Goniometer, and the strength of grip and pinch was evaluated by Dynamometer and Pinch gauge and dexterity evaluated by Minnesota Manual Muscle test. Results: The results indicated that both traditional and MVF methods induced significant decreasing pain (Pain Rate Index: F = 68.48, P = 0.000; Number of Word Count: F = 70.96, P = 0.000), disability ( F = 50.08, P = 0.000) and increasing dexterity (placing test: F = 28.73, P = 0.000), and range of motion ( F = 33.16, P = 0.000). The results also showed that the positive effect of MVF on pain, disability, dexterity, and range of motion was significantly greater than that of controls ( P < 0.05), but there was no significant result in grip and lateral pinch strength between the intervention and control group ( P > 0.05). Conclusion: MVF, in conjunction with traditional rehabilitation programs, may lead to greater improvements in pain, disability, placing dexterity, and range of motion. But it seems not to be effective on pinch and grip power and turning dexterity.