Get a sharp pain in my left ankle & can't bear weight, not in the bone. not brought on by anything and will go months with no pain. no history of traum?

Ankle: How do you know it is not in the bone ? You need an exam and xrays. It sounds like you may have a piece of cartilage or bone in the joint that may be causing your pain. Certainly a better history and exam will shed light on. This. See your podiatrist.

Degenrative changes: Could be a factor here: along with the possible meniscoid body, fibrosis of the joint, gout, etc... Have it checked by a foot and ankle specialist.