Posterior Shear Test for Lumbar Instability | Rationale & Interpretation

The video tutorial explains the posterior shear test, a method to assess posterior lumbar instability. It covers the positioning of the patient and the physical therapist's hands, focusing on stabilizing the L5 vertebra and palpating the L4 vertebra. The tutorial provides detailed instructions for the patient to perform scapular protraction while maintaining force balance. The goal is to detect any excessive posterior movement of L4 relative to L5, indicating instability. The video emphasizes the importance of proper technique and hand positioning to accurately assess the condition.

What is the primary purpose of the posterior shear test?

• To test knee joint stability

• To measure hip flexion range

• To evaluate posterior lumbar instability

• To assess anterior lumbar instability

During the posterior shear test, where should the caudal hand be placed?

• On the L4 spinous process

• On the L3 spinous process

• On the L5 spinous process

• On the patient's ASIS

What is the role of the cranial hand in the posterior shear test?

• To stabilize L5 firmly

• To palpate L4 loosely

• To apply force on the patient's ASIS

• To detect movement of L5

How should the patient initially position their hands during the test?

• On their own knees

• On the PT's back

• On the PT's ASIS with hand over hand contact

• On the PT's shoulders

What action should the PT take to maintain balance during the test?

• Allow the patient to push them backward

• Apply an equal and opposite force

• Shift weight backward

• Move away from the patient

What indicates a positive posterior shear test?

• No significant movement detected

• Movement of L5 relative to L4

• Excessive posterior translation of L4 relative to L5

• No movement of L4 relative to L5

In the event of a positive test, what movement is detected?

• Excessive posterior movement of L4

• Anterior movement of L4

• No movement at all

• Posterior movement of L5