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.
Falls and bumps that wouldn't hurt a person with healthy bones can damage them when you have osteoporosis. Doctors call these injuries low trauma or fragility fractures. If you fall from standing height and break a bone, for example, you'll need treatment for this type of injury. Some fractures can heal on their own, depending on which bone is broken and how severe the break. When you need further treatment your doctor may refer you on to specialists such as: 1  An orthopedic doctor, who can help cast and repair your broken bone.