Shoulder Impingement Evidence: confirmed

Internal Rotation Resistance Stress Test (IRRST) Special Test

Orthopedic Physical Examination & Clinical Assessment Guide

Internal Rotation Resistance Stress Test (IRRST) Orthopedic Special Test

What is it used for?

  • Differentiating Internal Impingement from Outlet Impingement.

How to Perform

  • Position: Abducted 90°, Externally Rotated 80°.
  • Action: Compare strength in External Rotation vs Internal Rotation.

Interpretation of Results

  • Internal Impingement: Weakness in Internal Rotation.
  • Outlet Impingement: Weakness in External Rotation.

Diagnostic Accuracy

  • Sensitivity: 88%
  • Specificity: 96%

References

  • Magee, D. J. (2021). Orthopedic Physical Assessment.