SPINAL MANIPULATION (Adjustments): By gently moving the spine and joints to their end range of motion and then quickly but gently thrusting, I can move or mobilize the involved area providing increased range of motion and reducing pain. The "popping" or "cracking" sound is actually what is know as a cavitation which occurs with the rapid movement of synovial fluid and gases within the joint. This causes the affected joint to become lubricated and relaxing the supporting muscles, ligaments and tendons . The bones are actually separating not rubbing during an adjustment. Numerous studies have show spinal adjustments to be a safe, effective treatment for back pain.