Avascular necrosis or AVN is a serious affliction that results in the Dying of the hip bones at the joint. The pain is much more extreme and consistent than with osteoarthritis. Electromyography (EMG): EMG tests measures the electrical exercise of muscles and will help establish whether nerve compression inside the https://www.theorthopaedicandpainpractice.com/service/lower-back-buttock-pain/