How does the reflex beneath the knee cap make your leg “swing” when you hit it?

Question

How does the reflex beneath the knee cap make your leg “swing” when you hit it?

In: 136

Answer 1

My leg has NEVER moved and inch from this test in my 37 years. Every doctor tries a few times and then just shrugs. I’m perfectly healthy, but I’ve never understood this test. Doesn’t seem to matter if you fail.