Purpose of O’Brien’s Active Compression Test: To detect superior glenoid labral lesions and/or type 2 superior labrum anterior and posterior (SLAP) lesions (which is fraying of the superior glenoid labrum along with detachment of the biceps anchor) on the shoulder joint (1-3). Patient position: Standing position, with affected arm in forward flexion at 90 degrees and slight adduction at 10-15 degrees towards the midline of … Continue reading O’Brien’s Active Compression Test