Five randomised controlled trials were included in the review (99 participants, range 10 to 30). Trial quality was rated as high (one trial), moderate (one trial) or poor (three trials). All of the trials reported randomisation but only two studies blinded their outcome assessors and only one study reported allocation concealment and intention-to-treat analysis. Only two studies reported prognostic similarity at baseline.
One of the poor quality trials reported that, compared with no splint, use of volar or dorsal hand splinting in the functional position for two hours (total time to outcome) was associated with a statistically significant increase in passive range of wrist extension and a decrease in hypertonus (quantitative results not reported).
No other statistically significant differences in any reported outcome were found by studies that compared an inflatable pressure splint or thermoplastic hand sprint (including dorsal, volar and finger-spreader splints) with controls (individual results reported in paper).