What is Birmingham hip resurfacing?
The Birmingham Hip Resurfacing (BHR) System is a metal on metal resurfacing artificial hip replacement system, surgically implanted to replace a hip joint. The BHR is called a resurfacing prosthesis because only the surface of the femoral head (ball) is removed to implant the femoral head-resurfacing component.
An Ideal candidate for Birmingham hip resurfacing?
BIRMINGHAM HIP Resurfacing System is ideal for younger or active patients considering hip replacement surgery as a treatment for hip pain or hip arthritis. Hip resurfacing is especially relevant to patients concerned about bone conservation.
Many hip pain sufferers under the age of 60 will outlive a traditional hip replacement and require a second, more difficult hip replacement surgery. For such patients, hip resurfacing might be the best route. Many active patients over 60 years old are also good BIRMINGHAM HIP Resurfacing System candidates, following review by a physician.
Inactive or elderly men and women are not ideal candidates for hip replacement surgery. Also, some chronic forms of arthritis severely deform the hip bones. Hip resurfacing may not be the best option for such patients.
How long will my BIRMINGHAM HIP Resurfacing System implant last?
It is impossible to say how long your implant will last because so many factors play into the lifespan of an implant. A clinical study showed the BIRMINGHAM HIP Resurfacing System had a survivorship of 98.4% at the five-year mark, which is comparable with the survivorship of a traditional total hip replacement in the under-60 age group.
How BIRMINGHAM HIP Resurfacing System works
The hip is a ball-and-socket joint. In a healthy hip, the ball-end of the femur (or thighbone) swivels smoothly in the socket of the pelvis, also called the acetabulum.
But in an unhealthy hip, the femur and acetabulum may become rough and worn. The bones of the joint rub together causing pain, swelling and stiffness.
Put simply, BIRMINGHAM HIP Resurfacing System is used in a surgical procedure that replaces these worn ball-and-socket surfaces in the joint with smooth, durable high carbide cobalt chrome.
For younger or physically active patients, hip resurfacing can be a bone-conserving alternative to total hip replacement surgery.
The implant
The BIRMINGHAM HIP Resurfacing System implant has two parts:
- A metal cap that locks onto the top of the femur and is a smooth ball on the outside.
- A corresponding smooth metal socket or cup that is locked into the pelvic socket.
Now instead of grinding bone on bone, the resurfaced metal on metal hip joint glides with a smooth, natural motion.
Metal on metal hip joints have been shown to be significantly more wear resistant than the traditional metal on plastic hip joints used in traditional hip replacement surgery. Some of the other currently sold metal on metal joints are using new technology that has had limited if any clinical validation.
The BIRMINGHAM HIP Resurfacing System metal on metal technology was based upon metal on metal joints that have demonstrated extremely low wear over decades of clinical use and now has over 8 years of use itself.
Total hip replacement versus hip resurfacing
For those suffering from severe hip arthritis, total hip replacement surgery is a very successful treatment option, and a welcome relief from pain.
Traditional total hip replacement removes the top of the femur. A new metal stem is inserted into the exposed bone shaft and a ball joint is locked onto the top of the stem. The new ball joint rotates against a plastic liner implanted in the pelvic socket.
Over time, the metal implant constantly rubs against the plastic liner. Loose plastic particles can accumulate, and the body’s attempt to breakdown these particles can cause loosening and premature replacement of the stem and cup.
Active younger patients can wear out these replacement hips, requiring a second, more difficult operation.
Both sides of the BIRMINGHAM HIP Resurfacing joint are made from high carbide cobalt chrome. This metal on metal joint means less friction and less wear in lab testing – 98% less wear than traditional metal on plastic implants.
High carbide cobalt chrome hip implants also endure wear better, and should last longer than plastic implants.
After traditional total hip replacement, between 1-4% of hip replacement patients suffer a dislocation of the hip. The BIRMINGHAM HIP Resurfacing System metal on metal joint reduces those odds of dislocation to 0.3% of resurfacing patients.
Resurfacing surgery is more bone conserving than traditional hip replacement surgery. BIRMINGHAM HIP Resurfacing System caps fit over the reshaped femur head, leaving most of the head of the femur intact – a bone conserving strategy especially valuable to younger or more active patients.
The BIRMINGHAM HIP Resurfacing System caps fit over the reshaped femur head, leaving most of the head of the femur intact – a bone conserving strategy especially valuable to younger or more active patients.
The BIRMINGHAM HIP Resurfacing System implant mirrors your own hip’s natural anatomic proportions. End result: a return to your normal active lifestyle.
Advantages of Hip Resurfacing:
- Allows the patient to squat and sit on the floor safely
- Allows a normal range of movement and sporting activities after operation
- Sacrifices only the diseased bone and preserves normal bone
- Restores the normal structures of the hip
- More natural feel after surgery
- Early rehabilitation
- Easy to revise if needed
- Less risk of dislocation
- No leg length alteration
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