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Type: Journal article
Title: Limb alignment in computer-assisted minimally-invasive unicompartmental knee replacement
Author: Keene, G.
Simpson, D.
Kalairajah, Y.
Citation: Journal of Bone and Joint Surgery: British Volume, 2006; 88B(1):44-48
Publisher: British Editorial Soc Bone Joint Surgery
Issue Date: 2006
ISSN: 0301-620X
Abstract: Twenty patients underwent simultaneous bilateral medial unicompartmental knee arthroplasty. Pre-operative hip-knee-ankle alignment and valgus stress radiographs were used to plan the desired post-operative alignment of the limb in accordance with established principles for unicompartmental arthroplasty. In each patient the planned alignment was the same for both knees. Overall, the mean planned post-operative alignment was to 2.3° of varus (0° to 5°). The side and starting order of surgery were randomised, using conventional instrumentation for one knee and computer-assisted surgery for the opposite side. The mean variation between the pre-operative plan and the achieved correction in the navigated and the non-navigated limb was 0.9° (sd 1.1; 0° to 4°) and 2.8° (sd 1.4; 1° to 7°), respectively. Using the Wilcoxon signed rank test, we found the difference in variation statistically significant (p < 0.001). Assessment of lower limb alignment in the non-navigated group revealed that 12 (60%) were within ± 2° of the pre-operative plan, compared to 17 (87%) of the navigated cases. Computer-assisted surgery significantly improves the post-operative alignment of medial unicompartmental knee arthroplasty compared to conventional techniques in patients undergoing bilateral simultaneous arthroplasty. Improved alignment after arthroplasty is associated with better function and increased longevity.
Keywords: Ankle Joint
Hip Joint
Knee Joint
Bone Malalignment
Osteoarthritis, Knee
Treatment Outcome
Preoperative Care
Surgery, Computer-Assisted
Arthroplasty, Replacement, Knee
Prospective Studies
Middle Aged
Rights: © 2006 British Editorial Society of Bone and Joint Surgery
DOI: 10.1302/0301-620X.88B1.16266
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