Logo of The Journal of Bone & Joint Surgery (Br)
Joint Replacement Instrumentation Limited (JRI) Ad
Quick search:        
          Advanced Search
Guest Access | Sign In
Journal of Bone and Joint Surgery - British Volume, Vol 88-B, Issue 1, 44-48.
doi: 10.1302/0301-620X.88B1.16266  
Copyright © 2006 by British Editorial Society of Bone and Joint Surgery
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Further opinion
Right arrow FrenchSpanishGermanItalianRomanianPolishRussianCzech
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow My Folders
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via ISI Web of Science (6)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Keene, G.
Right arrow Articles by Kalairajah, Y.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Keene, G.
Right arrow Articles by Kalairajah, Y.

Limb alignment in computer-assisted minimally-invasive unicompartmental knee replacement

G. Keene, MB BS, FRACS(Orth), FASMF, Consultant Orthopaedic Surgeon1; D. Simpson, FRCS(Tr & Orth), Orthopaedic Research Fellow1; and Y. Kalairajah, MA, MPhil, FRCS(Tr & Orth), Orthopaedic Research Fellow1

1 Sportsmed-SA Orthopaedic Clinic, 32 Payneham Road, Stepney 5069, Adelaide, South Australia.

Correspondence should be sent to Dr G. Keene; e-mail: gregkeene{at}ozemail.com.au

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.




This article has been cited by other articles:


Home page
 J Bone Joint Surg BrHome page
W. K. Barsoum, R. W. Patterson, C. Higuera, A. K. Klika, V. E. Krebs, and R. Molloy
A computer model of the position of the combined component in the prevention of impingement in total hip replacement
J Bone Joint Surg Br, June 1, 2007; 89-B(6): 839 - 845.
[Abstract] [Full Text] [PDF]


(c) British Editorial Society of Bone and Joint Surgery All Rights Reserved
Registered charity no: 209299     Print ISSN: 0301-620X
Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General