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The Oxford® Partial Knee
The Oxford® Partial Knee implant from Biomet Orthopedics is a partial knee implant designed to repair only one side of the knee (the medial side), making it much smaller than a total knee implant.
In patients with only limited knee arthritis, known as medial compartment arthritis, surgeons may elect to perform a partial knee replacement. Unlike total knee replacement that removes all the knee joint surfaces, a partial knee replacement replaces only one side of the knee joint. Some advantages of the Oxford® partial knee replacement are that it removes 75% less bone and cartilage, is less painful, enables a more rapid recovery, and provides more natural motion when compared to a total knee replacement.1-3
By retaining all of the undamaged parts, the joint may bend and function more naturally.
Knee osteoarthritis usually occurs first in the medial (inside) portion of the joint. In knees that are otherwise healthy, a partial knee implant procedure can preserve the healthy bone, cartilage, and ligaments, potentially preventing or delaying the need for total knee replacement.
Unlike other implants, the Oxford® Partial knee is currently the only fully mobile bearing partial knee system available in the United States.
Research has shown that partial knee replacements with moveable plastic bearings like the Oxford® Partial knee have low wear rates, potentially giving them even longer life expectancies.4
The free floating nature of the device potentially provides for a more natural feeling knee.
In a healthy knee, the meniscus serves as a shock absorber between the ends of the bones. The Oxford® Partial knee is the first partial implant with an artificial meniscal bearing designed to glide freely throughout the knee's range of motion, more closely replicating normal movement. The free floating nature of the device potentially provides for a more natural feeling knee.
Published long-term clinical results on the Oxford® Knee demonstrated a 98% success rate at 10 years and 95% at 15 years and beyond, equaling the results of the most successful total knee replacements.5,6
There is no guarantee that any implant will successfully function for a specific length of time, as there are a multitude of variables that affect the life of an implant.
Not all patients are candidates for Oxford® partial knee replacement. You should discuss your condition and treatment options with your surgeon. Biomet offers the broadest range of partial knee replacements available, providing your surgeon with unparalleled flexibility to address your condition. All provide the option of minimally invasive surgery.
You are unique. So when a part of you becomes affected by arthritis, you want a solution that's just for you. That's why Biomet offers Signature Personalized Patient Care*, utilizing MRI (magnetic resonance imaging) technology to create personalized positioning guides for Oxford® partial knee replacement. Using MRI technology and patient-matched guides, the Signature system allows for personalized instrumentation for positioning of the Oxford® partial knee.
The Signature system features custom femoral (thighbone) and tibial (shinbone) positioning guides made to fit directly onto your unique anatomy. The Signature guides are developed from an MRI scan. The MRI is used in conjunction with computer software to create a three-dimensional image of your unique joint. This enables surgeons to plan Oxford® partial knee replacement before surgery. Most surgeons typically plan surgery using two-dimensional X-rays. Using MRI and Signature personalized positioning guides, surgeons have access to enhanced detail and precision for implant position and alignment before surgery. This allows for personalized instrumentation for positioning of the implant and may help enhance surgical efficiency.
Your preoperative experience will be like that of most total knee patients except that an MRI of your affected leg will be required. The typical MRI scan will last approximately 20 minutes. The scan will only be performed on the hip, knee and ankle, so your head will remain outside of the machine. The MRI is used for preoperative planning by your surgeon and for the design and manufacture of the Signature personalized positioning guides that will be used during your knee replacement.
During typical knee replacement, metal instruments are used to remove the damaged bone and cartilage, to confirm implant sizing, and to establish proper implant positioning and alignment on the bone. Additionally, traditional knee replacement sometimes uses instruments placed inside the femur (thighbone) and/or tibia (shinbone) to assist with implant alignment and positioning.
Signature Knee Replacement
After surgery, you probably will be hospitalized for two to three days. Recovery time varies, but most people should be able to drive after two weeks, garden after three to four weeks, and golf after six to eight weeks. Your surgeon will tell you when and what activities you can return to and what activities to avoid.
If you have questions regarding the Oxford® Partial Knee, please speak with an orthopedic surgeon.
Not all patients are candidates for partial knee replacement. Only your orthopedic surgeon can tell you if you're a candidate for joint replacement surgery, and if so, which implant is right for your specific needs. You should discuss your condition and treatment options with your surgeon. The Oxford® Partial Knee is intended for use in individuals with osteoarthritis or avascular necrosis limited to the medial compartment of the knee and is intended to be implanted with bone cement. The Oxford® Knee is not indicated for use in the lateral compartment. Potential risks include, but are not limited to, loosening, dislocation, fracture, wear, and infection, any of which can require additional surgery. For additional information on the Oxford® knee, including risks and warnings, talk to your surgeon and see the full patient risk information on Biomet.com.
Biomet is a manufacturer of orthopedic implants and does not practice medicine. Only an orthopedic surgeon can determine what treatment is appropriate. Individual results of total joint replacement may vary. The life of any implant will depend on your weight, age, activity level, and other factors. For more information on risks, warnings, and possible adverse effects, see the Patient Risk Information section found within Biomet.com. Always ask your doctor if you have any questions regarding your particular condition or treatment options.
1. Data on file at Biomet. Note: bench test results do not necessarily indicate clinical performance.
2. Murray, DW. "Mobile bearing Unicompartmental knee replacement." Orthopedics. 2005:28:985-987.
3. Deshmukh, RV, Scott, RD. "Unicompartmental knee Arthroplasty: long-term results." Clinical Orthopedics and Related Research. 2001; 392:272-278.
4. Price, A.; et al.: "Ten-Year In Vivo Wear of a Fully Congruent Mobile Bearing Unicompartmental Knee Arthroplasty," AAOS, Paper No. 58, 2004.
5. Murray, D.W.; O'Connor, J.J.; and Goodfellow, J.W.: "The Oxford Medial Unicompartmental Arthroplasty. A Ten Year Survival Study." JBJS (Br), No. 6, 80-B: 983-989, 1988.
6. Price, A J., Svard U. The Oxford Medial Unicompartmental Knee Arthroplasty Fifteen-Year Survival Results From an independent series B.O.A. Meeting 2000, London.
OXFORD® SIGNATURE TECHNIQUE ANIMATION