Value of a clinical test of sub-acromial impingement to predict response to physiotherapy with dynamic humeral centering: A preliminary study.

BACKGROUND: Dynamic humeral centering (DHC) is a physiotherapy modality that aims to prevent sub-acromial impingement of rotator cuff tendons. We recently developed a new clinical manoeuver - the Viggo-Cochin test - to enhance the ability of the Neer test to detect sub-acromial impingement. Here we hypothesised whether the DHC effect may differ between individuals with positive and negative Viggo-Cochin test results. OBJECTIVE: To assess the association between DHC and Viggo-Cochin test results. METHODS: Individuals with shoulder pain due to sub-acromial impingement underwent the Neer and Viggo-Cochin tests at baseline. They were assessed before and after DHC by the Shoulder Pain and Disability Index (SPADI). A positive response to DHC was defined as a 20% reduction in the SPADI. RESULTS: We included 50 individuals (53 shoulders). The response to DHC did not differ by Neer test result at baseline: OR 0.73 [95% CI 0.22-2.38] (p= 0.601). By contrast, the response to DHC was 5-fold higher with a positive than negative Viggo-Cochin test result: OR 5.11 [95% CI 1.47-17.78] (p= 0.010). CONCLUSIONS: We found a higher clinical response to DHC with a positive than negative Viggo-Cochin test result at baseline in individuals with shoulder pain due to rotator cuff disease.