In patients with only limited knee arthritis, surgeons may elect to perform a unicompartmental (partial) knee replacement. Unlike total knee replacement involving removal of all the knee joint surfaces, a unicompartmental knee replacement replaces only one side of the knee joint. Knee osteoarthritis usually occurs first in the medial (inside) compartment as this side of the knee bears most of the weight. In knees that are otherwise healthy, a unicompartmental approach allows the outer compartment and all ligaments to remain intact. By retaining all of the undamaged parts, the joint may bend better and function more naturally.
This week, it’s a paper published in the January 2008 Journal of the American Academy of Orthopaedic Surgeons (“Unicompartmental Knee Arthroplasty,” Todd Borus, M.D. and Thomas Thornhill, M.D.) that found partial knee replacement (also known as unicompartmental knee arthroplasty) is becoming a popular alternative to full knee replacement in patients with knee arthritis. Previously, a partial knee replacement was performed mainly on patients who were older and who lived a more sedentary lifestyle.
Oxford medial unicompartmental knee arthroplasty in patients younger and older than 60 years of age
A. J. Price, DPhil, FRCS(Orth), Clinical Lecturer, Honorary Consultant1; C. A. F. Dodd, FRCS, Consultant Orthopaedic Surgeon1; U. G. C. Svard, MD, Consultant Orthopaedic Surgeon2; and D. W. Murray, MD, FRCS(Orth), Professor of Orthopaedic Surgery1
We present a comparison of the results of the Oxford unicompartmental knee arthroplasty in patients younger and older than 60 years of age. The ten-year all-cause survival of the < 60 years of age group (52) was 91% (95% confidence interval (CI) 12), while in the 60 years of age group (512), the figure was 96% (95% CI 3). For the younger group, the mean Hospital for Special Surgery score at ten-year follow-up (n = 21) was 94 of 100, compared with a mean of 86 of 100 for the older group (n = 135).… Read the rest
Long-term Clinical Results of the Medial Oxford Unicompartmental Knee Arthroplasty.
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Clinical Orthopaedics & Related Research. 435:171-180, June 2005.
Price, A J DPHIL, FRCS (ORTH); Waite, J C FRCS (ORTH); Svard, U MD
The medial Oxford unicompartmental knee arthroplasty uses a fully congruent mobile bearing, varying in thickness from 3.5-11.5 mm. Impressive clinical and survival results have been achieved by the designing surgeon, but can they be reproduced by an independent center and does the use of bearings less than 6 mm thick reduce the implant’s survival?
SAN FRANCISCO – Knee and limb mechanical axis alignment measurements made using radiographs were found to be inaccurate when compared to measurements obtained intraoperatively using computer-assisted navigation, according to results of a study presented here.
“From my point of view, navigation seems to be a valuable tool for assessing component alignment but, more importantly, it is a more-validated tool than radiographs,” S. David Stulberg, MD, said during the Knee Society/American Association of Hip and Knee Surgeons Specialty Day Meeting…
SAN FRANCISCO – March 6, 2008 – When it is time to replace a knee, a hybrid implant appears to have better longevity than conventional, totally cemented versions, according to a report at the American Academy of Orthopaedic Surgeons (AAOS) 75th Annual Meeting.
“Reducing revision rate is a key goal as we go to younger, more active patients [who need knee replacement],” said Mark Zawadsky, MD, Chief of Arthroplasty Service, Kaiser Permanente, Oakland, California, but “cementless knee implants have a lower cumulative survival rate,” according to new data presented here March 5.
As my own hairline goes the way of the buffalo and my beltline gradually expands, I take comfort in knowing that as I approach my fifties I have plenty of company – particularly on the golf course. Studies show that there are about six million U.S. golfers over the age of fifty.
Unfortunately, older players can be afflicted with various medical conditions that might make playing golf painful or even dangerous. From an orthopedic point of view, arthritis of the hip and knee are common and painful problems that can ruin an otherwise good day of golf.
Recently, the FDA has approved the use of robotic guidance systems to assist your surgeon with removing and resurfacing only the arthritic part of a knee without sacrificing your entire knee joint. This “least invasive” procedure is performed through a 2-3 inch incision and allows your surgeon to preserve as much of your natural bone and tissue as possible.