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Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy 1/2013

01.01.2013 | Knee

Computer-assisted navigation for the intraoperative assessment of lower limb alignment in high tibial osteotomy can avoid outliers compared with the conventional technique

verfasst von: Kilian Reising, Peter C. Strohm, Oliver Hauschild, Hagen Schmal, Mohmed Khattab, Norbert P. Südkamp, Philipp Niemeyer

Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy | Ausgabe 1/2013

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Abstract

Purpose

Longterm outcomes after valgization high tibial osteotomy (HTO) to treat varus osteoarthritis seem to depend mainly on correction precision. Intraoperative assessment of leg alignment based on radiological visualization of the mechanical axis is difficult and its precision is limited. A promising approach to improving precision is to make use of navigation systems. The case–control study reported here involved the evaluation of patients whose varus osteoarthritis had been treated by open-wedge high tibial ostoetomy, and an analysis of the effect of computer-guided navigation on postoperative leg alignment.

Methods

Forty patients with medial varus osteoarthritis managed by open-wedge high tibial osteotomy using a surgical navigation system were included in the present study (Group 1). They were compared with a retrospective control group (Group 2) of 40 patients with respect to postoperative leg alignment, correlation of planned and definitive correction, and postoperative deviation from the Fujisawa point.

Results

The mean values for planned and definitive correction showed no significant differences for identical demographic data. As a percentage of the width of the tibial plateau the postoperative weight-bearing radiographs showed a mechanical line that intersected with the knee base line at the desired value of 62 % (Fujisawa point) in 58.8 % (SD ± 6.1) in Group 1 and in 58.6 % (SD ± 8.1) in Group 2. Despite similar mean values a significantly higher number of corrections were outside the reference area (n = 7) in the non-navigated group, whereby all corrections were within the desired range in the navigated group. There were no significant differences in operation time.

Conclusions

This study showed that the use of a navigation system can not increase the precision of the open-wedge HTO procedure in patients with varus osteoarthritis but it can eliminate the outliers of a well defined range.

Level of evidence

Case-control study, Retrospective comparative study, Level III.
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Metadaten
Titel
Computer-assisted navigation for the intraoperative assessment of lower limb alignment in high tibial osteotomy can avoid outliers compared with the conventional technique
verfasst von
Kilian Reising
Peter C. Strohm
Oliver Hauschild
Hagen Schmal
Mohmed Khattab
Norbert P. Südkamp
Philipp Niemeyer
Publikationsdatum
01.01.2013
Verlag
Springer-Verlag
Erschienen in
Knee Surgery, Sports Traumatology, Arthroscopy / Ausgabe 1/2013
Print ISSN: 0942-2056
Elektronische ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-012-2088-1

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