Prone Instability Test | Rationale & Interpretation

The video tutorial explains the prone instability test, a diagnostic tool for patients with low back pain. It categorizes patients into treatment groups based on their symptoms, such as hypermobility or instability. The test involves positioning the patient in a prone position, applying PA forces to the lumbar spine, and checking for pain reduction when the patient moves to an active position. Muscle activation, particularly of the lumbar paraspinals and core, plays a crucial role in stabilizing the hypermobile segment, leading to pain reduction and a positive test result.

What is the primary purpose of the prone instability test?

• To diagnose radiculopathy

• To assess the flexibility of the spine

• To classify patients with low back pain into treatment groups

• To measure the strength of the lumbar muscles

During the prone instability test, where should the patient's hip crease be positioned?

• Above the lumbar spine

• On the floor

• At the edge of the table

• In the middle of the table

What is the key indicator of a positive prone instability test?

• Increased pain in the active position

• Increased flexibility of the spine

• Pain reduction with stabilization

• No change in pain levels

Which muscles are primarily responsible for stabilizing the hypermobile segment during the test?

• Biceps and triceps

• Lumbar paraspinals and core muscles

• Calf muscles

• Quadriceps and hamstrings

Why is there typically less pain in the active position during the prone instability test?

• The patient is lying down

• The lumbar muscles are activated, providing stabilization

• The test is performed incorrectly

• The patient is distracted