Tag Archive: customized knee replacement

Current Concepts Regarding Customized Knee Replacement

                  Osteoarthritis is a degenerative joint disease that can affect any joint and is most commonly found among older people. The mechanism of how the disease develops is not fully understood. Currently, there is no known cure for osteoarthritis and research has focused on the knee arthritisprevention and treatment of symptoms for this condition. Osteoarthritis is more frequently found in joints of the lower limb. Risk factors of osteoarthritis include history of injury, increasing age and obesity. Conservative treatment for osteoarthritis includes the use of oral medication to provide pain relief, physical therapy and as a last resort, a surgical procedure known as total knee arthroplasty (TKA). TKA involves the replacement of the entire knee joint and rehabilitation is required after surgery for patients to be able to return to their routine activities.

                  TKA is a highly successful surgical procedure but failures can occur, mostly due to infection and loosening of implants (parts). Poor positioning of the components can contribute to loosening as it creates areas of stress. Some patients such as those who are younger and those with other health conditions may sometimes require a revised TKA. Studies have also shown that the demand for TKA will increase as much as 673% from 2005 to 2030 with a total of 3.48million procedures being required. This necessitates the need to improve the outcomes of TKA especially for younger patients.

                  In a traditional knee replacement surgery (TKA), the surgeon uses a standard implant from a range of different standardized sizes. The necessary adjustments are then made so that it fits the patient during the surgery. Since the standard implants are not designed specifically for each individual patient, it may result in an implant overhang (where the implant is bigger and hangs over the bone) or underhang (implant is too small leaving parts of the bone exposed and uncovered). It iFit-Designcan also result in an implant that does not align exactly. Studies have shown that compromises such as the overhang, underhang and slight misalignment can cause pain after surgery.

                  In customized knee replacement surgery, partial and total knee implants are designed and tailored specifically for each individual patient. This new technology is utilized to create customized implants that are specifically fit to each patient’s natural knee shape and curves. This enables the potential for the patient to feel like they have a more natural knee. Other benefits include optimal bone preservation. The goal of customized knee surgery is to restore the patient’s knee as close as possible to their pre-diseased state.

                  A computed tomography (CT) scan or magnetic resonance imaging (MRI) scan is taken of the patient’s knee and the data is processed in a computer assisted design (CAD) system. The implants are then designed and manufactured specifically for that patient. With customized knee replacement surgery, hospitals benefit due to the improved efficiency of surgery while patients benefit with a shorter surgery and recovery time with improved knee alignment due to a better fitting implant.

OSPI offers the best knee replacement doctors in Arizona who perform customized joint replacement. In addition, the procedures may be performed as an outpatient when indicated. Most insurance is accepted, call us today!

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Customized Knee Replacement in Arizona

The knee is a complex, mobile joint. Knee joints are the largest joints of the body, and they differ in shape and size from other joints. A customized knee replacement uses specially designed implants that are made to fit the unique knee of the patient. Traditional knee replacement requires the surgeon to attempt to match prostheses to fit the knee.

How many knee replacements are performed each year?

In the United States, around 4.7 million people have a total knee replacement. Prevalence increases with age, with around 8% canstockphoto11809008have a history of total knee replacement. Women are more likely to have this operation than men (3 million: 1.7 million).

Why are customized knee implants important?

Once the Arizona knee surgeon selects the implant, the technique requires precision structuring so the implant fits snugly with your individual bone structure. An improper implant fit could result in residual issues that may cause problems after surgery.

Customized knee replacements are an innovative approach to correctly knee problems. The need for a precision implant fit has driven this new trend. Manufacturers now offer customized and personalized implants that are appropriate for gender and the individual knee. In a 2010 study, customized implants were found to reduce sizing problems during surgery, and also, found to replicate the curvature of the patient’s knee, giving a more natural feel to the replacement.

How are customized knee prostheses made?

Customized knee implants are created from CT and MRI scan data obtained from the patient. This assures the implant iFit-Designmatches the natural curves and shape of the knee. Knee implant manufacturers use specific technology to change the images of the knee into a 3D model, which is used to make an implant that matches the patient’s knee. Using scan data, the manufacturer can customize the implant using computer-assisted surgical instrumentation utilized by the surgeon during the procedure.

Why are women’s implants different than men’s?

Called gender-specific knee replacement, women are more petite and require special sized implants. A regular, traditional implant is designed for men, which means the implant for a woman could overhang on the bone at the sides. This could cause soft tissue interference or mid-flexion instability. For some patients, over-sized implants may cause pain and discomfort long after healing is complete. For this reason, new implants are used to accommodate the knee, which is smaller top-rightin women from side-to-side and from front-to-back. This reduces implant misfit and persistent knee pain.

Why do the differences between men and women make knee replacement difficult?

Researchers have found many differences between women’s knees and men’s. The gender-specific implants are based on research that shows:

  • Women’s knees have a thinner profile at the front.
  • Women’s knees have a distinct shape that accommodates the different angle between the knee and hip.
  • Women’s knees have a different contour.

Some researchers believe the differences in knee shape and size have less to do with gender and more to do with genetics. Certain ethnic influences tend to determine knee joint sizes.

Orthopedic and Sports Performance Institute offers customized knee replacements that have an amazing fit with exceptional outcomes. The total knee replacement surgeons in Arizona work with patients from all over the Valley including Gilbert, Mesa, Chandler, Queen Creek and Maricopa AZ.

Most insurance is accepted, call today to meet with the top knee specialists in AZ!

Resources

Bourne, et al; Patient Satisfaction after Total Knee Arthroplasty. Who is Satisfied and Who is Not? Clinical Orthopedics and Related Research; 2010, 468: 57-63.

Mahoney, et al; Overhang of the Femoral Component in Total Knee Arthroplasty: Risk Factors and Clinical Consequences. The Journal of Bone and Joint Surgery; 2010, 92: 1115-1121

 

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