Jerk Test

What is the "Jerk Test" used for?

• Posterior Instability

How to perform the "Jerk Test"?

• 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.

What is the positive result?

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

Test Accuracy

• Sensitivity: 73 %
• Specificity: 98%

References

• Jerk Test | Orthofixar
• Kim, Seunghae & Park, Jun-Sic & Jeong, Woong Kyo & Shin, Seong. (2005). The Kim Test A Novel Test for Posteroinferior Labral Lesion of the Shoulder—A Comparison to the Jerk Test. The American journal of sports medicine. 33. 1188-92. 10.1177/0363546504272687.