true leg length discrepancy test

true leg length discrepancy test

A clinical test used to identify true leg length discrepancy.

Technique
The patient is placed in a supine position. The examiner uses the Weber-Barstow manoeuvre to “clear the hips” (i.e., place the patient’s feet on the table and have him or her raise and lower the hips), then has the patient extend both legs; the examiner measures the distance from the anterior superior iliac spine (ASIS) to the highest point of the medial malleolus on each leg, or the examiner measures the distance from the ASIS to the highest point of the lateral malleolus on each leg. 

Positive test
A difference of more than ¼ inch between the legs suggests possible structural leg length difference.