Stork Standing Test: Checking for Spondylolysis

The Stork Standing Test (One-Leg Standing Extension Test) is a provocative orthopedic maneuver used to identify posterior column pathology in the lumbar spine, specifically spondylolysis (pars defect) and spondylolisthesis.

1. Purpose

The primary purpose of the Stork Standing Test is to **detect** spondylolysis (a defect or stress fracture in the pars interarticularis) or spondylolisthesis. It places significant stress on the posterior structures of the lumbar spine.

2. How to Perform

1. The patient is positioned in standing.
2. The examiner stands behind the patient for safety.
3. The patient is instructed to lift one leg and place the foot flat against the popliteal fossa (back of the knee) of the standing leg.
4. The patient then actively extends (arches) their spine backwards.
5. The test is repeated on the other leg.

3. Positive & Negative Sign

Positive Sign (Test is POSITIVE):
A positive test is indicated by localized pain in the lower back.

• Pain felt on the standing leg side specifically suggests a unilateral pars interarticularis fracture (spondylolysis) on that side.

Negative Sign (Test is NEGATIVE):
A negative test is when the patient performs the movement with no pain.