Without variable valve timing or variable valve lift, the valve timing must be the same for all engine speeds and conditions, therefore compromises are necessary. An engine equipped with a variable valve timing actuation system is freed from this constraint, allowing performance to be improved over the engine operating range.
A variety of medical specialists treat people with osteoporosis, including internists, gynecologists, family doctors, endocrinologists, rheumatologists, physiatrists, orthopaedists, and geriatricians. There are a number of ways to find a doctor who treats osteoporosis patients. If you have a primary care or family doctor, discuss your concerns with him or her. Your doctor may treat the disease or be able to refer you to an osteoporosis specialist.
In brief: Osteopathic Eval. Some osteopathic physicians do manipulation to see if a vertebrae is dislocated and he/she can offer treatment by trying to correct the pathology. If this does not help, it could be pathology in your spine that needs to be further evaluation. Recommend seeing a pain/spine specialist.