One of the tell-tale signs of a slipped disc is a patient who has to use their arms walking up their thighs in order to stand up.
This happens because a slipped disc is often caused by a weakness of the muscles that allow us to stand up, particularly the gluteal muscles.
You can clearly see this patient using his arms to help him stand up.
You can also see the dramatic return to strength and normal mobility as he changes the afferent input he gets by biting on a gold crown.