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Navigated, minimally invasive TKA offers better early results than
conventional approach
By Robert Trace
September 2007
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SEOUL - Investigators reported that patients who received total knee arthroplasty via a navigated, minimally invasive approach demonstrated better
functional scores at 9 months, including less blood loss and pain, compared with
conventional procedure patients.
However, the researchers failed to see those differences at 1- and 2-year
follow-ups.
In the prospective study, researchers compared clinical and radiological results
using navigation-assisted minimally invasive (NA-MIS) and conventional
techniques in bilateral total knee arthroplasty (TKA).
The research team followed 42 patients who received simultaneous bilateral TKA
(84 TKAs), said Eun-Kyoo Song, MD, of Chonham National University Hwasun
Hospital in Korea. They followed the patients for a minimum of 2 years and
performed clinical evaluations - including range of motion (ROM), Hospital for
Special Surgery (HSS) and WOMAC tests - at 3 and 6 months, and at 1 and 2 years
postoperatively.
"We also compared patient subjective preferences as well as radiological
[accuracies] between the two groups at 1-year postop," Song said at the 15th
Triennial Congress of the Asia Pacific Orthopaedic Association (APOA).
Patients' range of motion and deformity were comparable preoperatively. The
preoperative HSS scores were 68.5 in the NA-MIS group and 66.5 in the
conventional group; these scores improved to 93.6 and 92.5 at 1 year
postoperatively, respectively, he said.
Knees had a higher average HSS score in the NA-MIS group than in the
conventional group up to 6 months postsurgery, but this difference vanished
after 9 months. Likewise, "The total WOMAC scores were also better in the NA-MIS
group up to 6 months out, but not after 9 months," Song added.
The ROM scores were comparable in both groups through all follow-up periods.
Still, "More patients said they liked MIS better because they felt it provided
better range of motion and less pain," Song said.
The radiological results were similar in both groups at 2 years, he added.
For more information:
Song E-K, Seon J-K, Park S-J, et al. Prospective comparative study between
navigation-assisted minimally invasive and conventional techniques in bilateral
total knee arthroplasties. F016-1. Presented at the 15th Triennial Congress of
the Asia Pacific Orthopaedic Association. Sept. 9-13, 2007. Seoul.
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