What is Bonnet Sign?
The bonnet sign is used to provoke the symptoms of sciatica. The Bonnet sign is also known as the piriformis sign.
The procedure of performing the Bonnet Sign
- The patient is asked to lie down in a supine lying position.
- After that, the patient is asked to flex his leg at the hip and knee joint.
- Now, after that, the examiner adducts and internally rotates the patient’s leg, as shown in the diagram below.
Here is the diagram of Hip Internal and External rotation
Test Results of the Bonnet Sign
Adducting and internally rotating the leg with the hip and knee flexed provokes the symptoms of sciatica. As adduction and internal rotation of the leg stretch the sciatic nerve as it passes through the piriformis muscle.
When the examiner performs the procedure (adducts and internally rotates the patient’s leg), this stretches the sciatic nerve, so if the patient is suffering from sciatica, the patient will experience an increment in pain.
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Sacroiliac Joint Tests
Mennell’s Sign / Mennell’s Test – Used to assess degenerative processes in the sacroiliac joint.
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Jackson Compression Test –Â To Detect Cervical Radiculopathy (Cervical Nerve Root Compression).
Spurling Test – For Diagnosing Cervical Radiculopathy.
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Lippman Test – To detect pathology in the long head of the biceps tendon.
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Resources
Clinical Tests for the Musculoskeletal System: Examinations-Signs-Phenomena by K. Buckup