Is a MRI neccessary if both of your knees have little knots on them?

Answer 1

First it would be a good idea to be examined by a doctor. What the little knots, as you call them, might be able to diagnosed with a physical exam, or less expensive X-rays. If you need a MRI you doctor will order it. Not every orthopedic condition needs an MRI.

Answer 2

that depends, do you want to know what those little knots are and perhaps what caused them?