Assessing anterior shoulder instability: Reliability of the humeral head centralization test

Background: Motor control impairment of the rotator cuff muscles is reported to compromise the stability of the glenohumeral joint. However, an easily applicable, reliable parameter for quantifying anterior translation of the humeral head during active arm movements is lacking. Therefore, a novel (humeral head centralization) test was developed and evaluated. Study design: Case-control study with reliability analysis (Level III). Methods: This research project examined the shoulders of 25 patients with anterior shoulder instability and 25 asymptomatic controls. A physical therapist assessed hu

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