 This study compared the accuracy of manual muscle testing to detect strength differences among grade 4 and 5 subjects with shoulder flexor weakness at varying percentages of dynamometric mean. The study found that manual muscle testing had higher diagnostic accuracy than dynamometry at 10% strength deficit for both non-dominant and dominant shoulders. However, the study also noted that the positive predictive value, PPV, and specificity of manual muscle testing was better at 10% strength deficit in comparison with dynamometric measures, whereas negative predictive value, NPV, and sensitivity was better at 20% strength deficit. Additionally, the study found that there was a contrasting association between PPV and sensitivity, suggesting that manual muscle testing may be more accurate when used as a screening tool for shoulder flexor weakness. This article was authored by Sadia Purways, Muhammad Waqar Afzal, and Gulam Fadima. We are article.tv, links in the description below.