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Computer-navigated total knee replacement Study by Dr. Kim 2012
http://www.kneesforyou.com/medical-studies/169-cpmputer-navigated-vs-conventinal-study
Nov. 21, 2012
Rosemont, Ill. - For many years, the use of computer-assisted navigation has
been touted as improving the positioning, sizing and alignment of replacement
knee joints, resulting in greater durability of joints and overall improvement
in patient movement. However, new research published in the Journal of Bone and
Joint Surgery (JBJS) found no difference in knee function, alignment or
durability/survivorship between joints positioned and completed with the help of
computer navigation, and those replaced with conventional total knee
arthroplasty (TKA) procedures.
Researchers in Korea compared the results of 520 patients with osteoarthritis
who underwent computer-navigated TKA for one knee and conventional TKA for the
other knee. Patients included 452 women (904 knees) and 68 men (136 knees).
Patients were assessed before surgery, and then at three months and one year
following surgery, and annually thereafter, for 10 to 12 years (mean assessment
duration: 10.8 years). Patients were assessed clinically using the Knee Society
rating system and the Western Ontario and McMaster Universities Osteoarthritis
Index (WOMAC) and. radiographically using X-rays or CT scans.
No statistically significant differences were noted between the
computer-navigated and traditional procedure scores pertaining to knee function,
pain, knee motion and activity, according to the study. In addition, the Knee
Society and WOMAC scores were comparable for both procedures.
"Our mid-term follow-up data demonstrated no difference in clinical function or
alignment and survivorship of the components between the knees that underwent
computer-navigated total knee arthroplasty and those that underwent conventional
total knee arthroplasty," said Young-Hoo Kim, MD, The Joint Replacement Center,
Ewha Womans University School of Medicine in Seoul, Korea.
Key Findings:
- Survivorship of the implants at 10.8 years after the operation was not
significantly different: 98.8 percent in the computer-navigated TKA group and
99.2 percent in the conventional TKA group.
- The length of the incision, the intra-operative blood loss, the duration
and volume of drainage, and the transfusion volume were not significantly
different between the two groups.
- The mean operative time and time during which the surgeons used a
tourniquet (a thigh band to minimize bleeding) were significantly longer in
the computer-navigated TKA group than in the conventional TKA group.
"The effect of computer-navigated total knee arthroplasty compared with
conventional total knee arthroplasty on long-term implant survival remains
unproven," said Dr. Kim.
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