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About Hip Replacement Surgery

Over time, the impact of joint injury, arthritis, or excessive body weight can erode the hip joint. Arthritis can be an inherited disease process that appears with age. One risk factor that is under the control of the person is their body weight. Excessive body weight can wear out the normal knee and hip joints which were never intended to carry a human that is morbidly obese.

The problem of obesity is growing, which in turn causes more joint problems. As of 2015, 34.9% of U.S. adults are obese or morbidly obese, according to the Journal of American Medicine (JAMA). The study also found that obesity worsens as a person enters their 40s and 50s. Obesity is higher among middle age adults, 40-59 years old (39.5%) than among younger adults, age 20-39 (30.3%) or adults over 60 or above (35.4%) adults.

Artificial hip joints

According to the American Academy of Orthopaedic Surgeons, each year in the United States, about 193,000 hip replacements are performed. With the aging of the post-World War II baby boom generation (those born between 1946-1964), that number is expected to grow significantly as this large segment of the population now age into their 50s, 60s and 70s. It is estimated that more than 500,000 knee and hip replacements will be done each year by 2040.

Also, the joint implant technology involved is improving, enabling the artificial joint to last longer. This enables more surgeons to recommend hip replacement with the belief that the artificial hip joint may outlive the life of the patient, thereby eliminating the need for a revision surgery on an elderly patient in their 70s or 80s.

Traditional open hip replacement surgery lasts between one-to-two hours, although an extremely proficient hip surgeon who does a large volume of cases may be faster. The hip surgeon makes an incision along the side of the hip and carefully moves the muscles at the top of the thighbone to reveal the hip joint. The surgeon then removes the ball and socket portions of the joint. Artificial joint parts are inserted into the thighbone and pelvis, and fixed into position to create the artificial joint.

The life of the artificial joint

Historically, artificial hip joints may wear out after 15 to 20 years, and outcomes of revisions are less ideal than original hip replacements. Consequently, surgeons try to delay hip replacement surgery as long as possible. In the United States, 65 percent of hip replacements are performed on those patients over the age of 65. It is also not recommended for the extremely obese, those with a terminal illness, on renal dialysis, or those with nerve disease. With newer materials that are now available, the expectation is a lifespan of up to 30 years.

The pros and cons of anterior vs. posterior hip replacement surgery

About 70 percent of hip replacement surgeries today are performed through a traditional posterior approach through the buttock area. Most medical schools train orthopedic surgeons to use the traditional posterior approach as the primary approach.

Some hip surgeons favor an alternative approach from the anterior side, or front side of the hip.

Direct anterior hip replacement

Direct Anterior Hip Replacement is a new surgery method that is an alternative to the conventional hip replacement surgery and is growing in popularity. It's currently only used in about 20% of cases in the U.S. In the past, hip replacement surgery required cutting certain muscles and tendons in order to access the area being fixed. Conversely, direct anterior hip replacement does not require the cutting of muscles or tendons to expose the joint being treated. This new surgery can be more difficult and requires special equipment including surgical instruments and operating tables.

Some studies have shown that Direct Anterior Hip Replacement surgery patients may have a faster recovery and may have less post-operative pain and discomfort than traditional hip replacement surgery. A 2014 study of 54 patients found that anterior hip replacement patients were able to walk unaided 6 days earlier than other hip replacement patients. Other studies have shown that the Direct Anterior Hip Replacement has fewer dislocations.

Direct Anterior Hip Replacement surgery, however, is not for all candidates. Some hip surgeons feel that anterior hip replacement has some issues: The nerve which supplies sensation to the front and side of the thigh can be more vulnerable to injury during surgery. Those patients who are obese, short, or the person with very muscular thighs are more challenging with an anterior approach.

In conclusion, there can be disagreement among hip surgeons as to what approach is the best one for a specific patient, and it's important to listen to your surgeon's recommendation rather than try to shop for an approach that may not be appropriate for you.

Ceramic vs Plastic

There are a large number of hip implant devices on the market and each manufacturer has different models composed of different materials. Currently the most popular implants are metal-on-plastic and ceramic-on-plastic.

There is no consensus in the orthopedic community regarding the single “best” bearing or material. The choice generally comes down to the patient's specific requirements and the surgeon's preference. Surgeons consider many variables when choosing one device over another, including his or her personal experience as well as tool and implantation method preferences.

Metal-on-plastic (polyethylene) is the longest tried and tested bearing. The femoral head is constructed of metal (usually a cobalt chrome alloy) and the cup liner is made of a plastic called polyethylene.

Because of its durability and performance, Metal-on-Plastic has been the leading artificial hip component material chosen by surgeons since hip replacement surgeries have been performed.

Ceramic is the 21st century answer to hip replacement as it is both hard and durable, it wears minimally and the material is widely deemed to have no toxic or side effects in the human body.
Ceramic-on-Plastic is a good combination of two very reliable materials. Ceramic heads are harder than metal and are the most scratch-resistant implant material. The hard, ultra-smooth surface can greatly reduce the wear rate on the polyethylene bearing. The potential wear rate for this type of implant is less than Metal-on-Polyethylene.

So why not choose ceramic-on-plastic every time? For one, ceramic heads are more expensive than metal. And in rare situations the ceramic head can shatter if the patient falls on their hip.
Only a qualified orthopedic surgeon can determine which implant system is best for your unique situation. There are many factors your surgeon uses when recommending hip implants. Be sure to ask questions and share any concerns you might have regarding specific implants with your surgeon early in the process.

Mako Robotic Joint Replacement

Millions of Americans suffer from arthritis in the hip. If you've exhausted non-surgical treatment options there is a new surgical advance called Mako Robotic Arm Assisted Surgery. Southern Bone & Joint Specialists is one of a few hip replacement centers in Mississippi and the Midwest to provide the use of robotic surgery for knee and hip replacement.

According to clinical studies, the use of Mako Robotic Surgery provided the following benefits:

  • More accurate placement and alignment of hip implants
  • Preservation of more healthy bone
  • Reduced risk of hip dislocation
  • Reduced blood loss during surgery
  • An improved feeling of a natural healthy hip

Before surgery, the hip replacement surgeon takes a CT scan of the hip joint to create a 3-dimensional model of the hip joint. This 3D model helps visualize aspects of the patient's specific hip joint that is not readily visible on a 2-dimensional x-ray.

Using this computer model, the doctor is then better able to determine the optimal size, placement and position of your artificial hip or knee joint. This enhances and improves the likelihood for an optimal hip or knee replacement surgery. In addition, the computer model can enable the surgeon who is trained in Mako Robotic Surgery to preserve more of the healthy bone in your hip.

One national study included 1,516 hip replacement patients, of which 994 underwent traditional hip replacement, while 522 had robotic-assisted hip replacement. The conclusion of the study was that "robotic-assisted Total Hip Arthroplasty has certain advantages over conventional THA, including the results of component positioning and rates of intraoperative complications."

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