Description
Introduction
O’Brien’s test are commonly done for diagnosing biceps-related lesion such as the SLAP lesion. However, due to the low specificity of the test, it is possible that the degree of pronation might play a role for accurately performing the test. This study is conducted to determine the degree of arm pronation to start stretching the long head of bicep brachii.
Methods
A study conducted on a 30 patients who undergo an arthroscopic-related procedure. The degree of arm pronation is measured in 4 quadrants (0-89°, 90-179°, 180-269° and >270°) viewing arthroscopically. Factors that are collected in this study include age, gender, humeral length, and arm circumference of the patients.
Result
80% of patients show positive biceps anchor movement when O’Brien test is passed the 3rd quadrant. No relationship between other anthropometric factors and quadrants of pronation required to stretch the biceps anchor.
Conclusion
This study suggests that the degree of arm pronation over 180° is necessary for adequacy of O’Brien’s test.
