Jerk Test

Jerk Test is used to test for Posterior Instability

have the patient sit straight up with the arm forward elevated to 90 degrees and internally rotated to 90 degrees.
Apply an axial load to the humerus to push it posteriorly.

positive if there is a ‘clunk’ or pain with the maneuver

Sensitivity: 73 %
Specificity: 98%

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