The spine is susceptible to osteoarthritis because of the motion between the vertebrae. It's most common in the lower back, or lumbar spine, because these joints carry most of the body weight.

Used in the nickname “funny bone,” “funny” means odd, not laughable. Though funny bone injuries (that actually result from hitting the ulnar nerve rather than a bone) are inconsequential, similar ongoing sensations may signal an unpleasant condition known as cubital tunnel syndrome.