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. 2004 Mar 6;28(4):193–197. doi: 10.1007/s00264-004-0549-y

Minimally invasive unicompartmental knee replacement with a nonimage-based navigation system

L Perlick 1,, H Bäthis 1, M Tingart 1, C Perlick 1, C Lüring 2, J Grifka 1
PMCID: PMC3456933  PMID: 15007563

Abstract

In a prospective study, two groups of 20 unicompartmental knee replacements (UKR) each were operated either using a CT-free navigation system or the conventional minimal invasive technique. Radiographic assessment of postoperative alignment was performed by long-leg coronal and lateral radiographs. The results revealed a significant difference between the two groups in favor of navigation. In the computer-assisted group, 95% of UKRs were in a range of 4–0° varus (mechanical axis) compared with 70% in the conventional group. The only inconvenience was a prolonged operation time (+19 min). Due to the limited exposure, the navigation system is helpful in achieving a more precise component orientation. The danger of overcorrection is diminished by real-time information about the leg axis at each step during the operation.

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Acknowledgements

The authors would like to thank the DePuy Company (DePuy I-Orthopaedics, Munich, Germany) for providing the Ci-Navigation-System.

References


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