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Objectives:  Glenohumeral injections can be performed using a variety of approaches. We hypothesize that the position of the ipsilateral arm affects the target zone for posterior approach of glenohumeral joints.    Material and Methods:  We performed ultrasound on three volunteers with arm with in neutral and varying degrees of flexion and extension.    Results:  We found that target zone is increased on flexion and decreased with arm in extension.    Conclusion:  Considering patient comfort, target zone, and operator ergonomics, we conclude that the posterior glenohumeral US-guided injections should be performed with patient lying on the contralateral side with the ipsilateral arm in neutral, and hand rested on the thigh (Birmingham Royal Orthopedic Hospital (BROH) position).

Effect of Arm Position on Visualization of Target Zone for Posterior Glenohumeral Joint Injection