Understanding how cartilage works helps understand how PEMF helps.

The use of PEMF is critical in accelerating cartilage repair. PEMF energizes the chondrocyte cells which produce the cartilaginous matrix thus speeding up the production of cartilage. Therefore, the stimulation of these cells produces new cartilage where previously it was damaged or worn out. At the same time the osteoclasts break down bone structure that has been damaged, worn out, or weakened, while the osteoblasts are stimulated to regenerate new bone structure.

PEMF systems of a higher intensity are necessary to penetrate bone and provide healing, pain relief, and the effects of reverse osteoporosis.