Background: A previously reported audit of use of the Manchester Short Splint versus the traditional dorsal forearm-based splint for rehabilitation of zone II flexor tendon repairs suggested that patient outcomes were enhanced by use of Manchester Short Splint. Specifically, there was less flexion contracture at the proximal interphalangeal joints at 6 and 12 weeks with greater final range of motion (Strickland assessment). Importantly, there was no evidence of excess tendon ruptures complicating use of the new splint. Methods: The present study is designed as a single-centre randomized controlled trial to compare the two splints [Clinical Evidence Level 2 as patient and treating therapists are aware of which splint is in use. Surgery is standardized with respect to the type of repair used. Inclusion criteria for the trial include single finger flexor tendon injury of zone II with up to one but not two simultaneous digital nerve injuries operated on within 4 days of the injury date. Exclusions include children, more complex injuries, those unable to give consent or otherwise co-operate with the trial protocol. Patients are recruited at their first hand therapy visit having been provided with information about the trial by one of the Site Investigators during their hospital admission. The consenting patient is randomized into one of two splint groups. Assessments recorded in the Case Report Form include range of joint motion (Strickland), PROMs (Quick Dash), visual analogue pain scales, tendon rupture event and need for further surgical intervention. Data is captured weekly for first 6 weeks and again at 12 weeks. At 12 weeks grip strength and fatigue of grip strength are also measured. Discussion: The present study aims to determine the efficacy of the short splint versus the traditional splint in rehabilitation of Zone II flexor tendon repair. Our earlier published audit on the potential advantages of the short splint generated considerable interest internationally with numbers of hand therapy departments adopting the short splint in the absence of more substantive evidence. Clearly it is desirable that such evidence is forthcoming and the present study seeks to provide such evidence and inform development of a multi-centre study.