Jerk test

Purpose

This test is used to detect posteroinferior 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]

[2]

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]


References

  1. 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
  2. Physiotutors. Jerk Test | Posteroinferior Labral Tear. Available from: https://www.youtube.com/watch?v=j_qG1MNOws8
  3. 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