Lasège’s Differential is used to reproduce radicular symptoms and to distinguish this from hip pain and hip pathology.


  1. Patient supine, examiner flexes patient’s hip to 90° with knee flexed.
  2. Examiner then extends patient’s knee on the leg demonstrating radicular symptom.


Pain with hip & knee flexed Hip joint pathology
Leg pain with leg straightening Radiculopathy

Clinical Notes

Differential used to distinguish hip pain from radicular pain.