It should be evoked in the presence of chronic mechanical lower back pain related to movement and exertion, relieved by rest, of varying intensity but often with moderate to severe functional impairment and impaired quality of life.
You need to be able to recognize the symptomatology of lumbar spinal stenosis: poorly systematised pain in the lower limbs and painful intermittent claudication.
One must always eliminate secondary lower back pain before talking about lumbar osteoarthritis.