Jerk test
Original Editor - Derek Little
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Purpose
This test is used to detect postero-inferior instability of the Glenohumeral joint.
Technique
While stabilizing the patient’s scapula with one hand and holding the affected arm at 90° abduction and internal rotation, the examiner grasps the elbow and axially loads the humerus in a proximal direction. The arm is moved horizontally across the body. A positive result is indicated by a sudden clunk as the humeral head slides off the back of the glenoid. When the arm is returned to the original position, a second jerk may be observed, that of the humeral head returning to the glenoid.[1]
Evidence
A systematic review of the validity and accuracy of clinical tests used to detect labral pathology of the shoulder showed the +LR of the Jerk Test to be LR 34.71 and the -LR to be 0.27.[3] The reported diagnostic accuracy for the jerk test was a sensitivity of 73% and specificity of 98%[4]
References
- ↑ Kim et al. Painful Jerk Test:& A Predictor of Success in Nonoperative Treatment of Posteroinferior Instability of the Shoulder.& Am J Sports Med 2004 32: 1849
- ↑ Jerk Test (CR) Available from: https://www.youtube.com/watch?v=mn7f6KVvScE [last accessed 27/2/2021]
- ↑ Munro et al. The validity and accuracy of clinical tests used to detect labral pathology of the shoulder- a systematic review. Man Ther. 2009 Apr;14(2):119-30
- ↑ Dhir J, Willis M, Watson L, Somerville L, Sadi J. Evidence-Based Review of Clinical Diagnostic Tests and Predictive Clinical Tests That Evaluate Response to Conservative Rehabilitation for Posterior Glenohumeral Instability: A Systematic Review. Sports Health. 2018;10(2):141-145.