Posterior Shear Test for Lumbar Instability | Rationale & Interpretation

The video tutorial explains the posterior lumbar shear test, a method to assess posterior lumbar instability. It details the positioning of the patient and the physical therapist's hands, emphasizing the stabilization of L5 and palpation of L4. The tutorial guides on instructing the patient to protract their scapulas to detect any excessive posterior movement of L4 relative to L5, indicating instability. The video also contrasts this with the anterior shear test and describes the expected sensations during a positive test.

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