Overhead Perturbation Training for Glenohumeral Joint Instability

The purpose of the trial is investigate the benefits of a novel, newly invented exercise technique protocol relative to physiological changes in upper limb proprioception (primary) and subjective readiness for return to sport (secondary). The intervention (Overhead perturbation training) will be compared with a control intervention (non-perturbed stimulus) in a population of type II anterior glenohumeral joint instability patients (according to the Stanmore classification of instability). Each group will be assessed at baseline for glenohumeral joint proprioception (via lazer-pointer active relocation test), as well as perceived functional level (via Western Ontario Shoulder Instability index) and Shoulder Instability-Return to Sport after Injury (SIRSI) score. They will then undertake a 6 week exercise regime which is exactly the same- except the intervention used perturbated stimulus and the control uses non-perturbed stimulus. Outcome measures are re-assessed at the end of the intervention period. Results will be assessed statistically for statistical significance.