22 patients who had undergone surgical repair of flexor tendon zone I-III injuries were randomly allotted to undergo either rehabilitation with passive motion protocol (PMP) with electromyographic biofeedback (EMG) (n=11) or PMP (n=11) alone. The primary outcome of the study was joint range of motion (ROM); secondary outcomes of interest included the Michigan Hand Outcomes Questionnaire (MHQ) and the grip strength which were evaluated up to 24 weeks. There were no statistically significant intergroup differences in ROM, MHQ scores, or grip strength. However, when looking at the effect sizes, clinically important differences in favour of the PMP+ EMG group were observed with respect to ROM at 12 weeks, Activity of Daily Living (ADL) in MHQ at 24 weeks, 12th and 24th weeks gross grip and tip pinch strength, and 12th and 24th-week lateral pinch grip.