What is O’Brien Test?
- O’Brien Test (active compression test) is used to test for labral injuries and SLAP lesions (Superior Labrum Anterior and Posterior injuries) of the shoulder joint.
How it's Performed?
- Patient forward flexes the affected arm to 90 degrees while keeping the elbow fully extended.
- The arm is then adducted 10-15 degrees across the body.
- The patient then pronates the forearm so the thumb is pointing down.
- The examiner applies downward force to the wrist while the arm is in this position while the patient resists.
- The patient then supinates the forearm so the palm is up and the examiner once again applies force to the wrist while the patient resists.
What does a positive O’Brien Test mean?
- O’Brien test is positive for SLAP tear when there is pain is “deep” in the glenohumeral joint while the forearm is pronated, but not when the forearm is supinated.
Sensitivity & Specificity
- Sensitivity: 100 %
- Specificity: 98 %
- It is crucial to inquire about the location of the pain as the O’Brien test can also yield positive results in the presence of acromioclavicular joint disorders.
- Pain reported within the shoulder suggests a SLAP lesion, whereas pain over the acromioclavicular joint may also be due to osteoarthritis of the acromioclavicular joint.
- Clinical Tests for the Musculoskeletal 3rd Ed. Book