AI Article Synopsis
- The study aimed to evaluate the effectiveness of using navigation for medial unicompartmental knee arthroplasty, specifically focusing on the tibial cut and limb alignment.
- The findings showed that while the tibial cut orientation was mostly accurate, there were challenges with excessive varus alignment and factors like pre-operative hip-knee-ankle angles affecting outcomes.
- The researchers concluded that even though their results were below previous expectations, understanding the factors that contributed to failures could help improve future performance of this technique.
Article Abstract
Purpose: Our purpose was to assess medial unicompartmental knee arthroplasty with navigation alone for the tibial cut and limb alignment. We hypothesised that this technique could be used routinely in practice.
Methods: Outcome measures were tibial cut orientation and residual varus. Six-month post-operative radiographs of 59 knees were assessed.
Results: Tibial cut orientation was within 2° of planned in 70.2 and 76.3 % of knees in the coronal and sagittal planes, respectively (49.1 % in both), within 4° in 91.2 and 91.5 %, respectively (82.5 % in both). All coronal-plane errors were in varus. Excessive planed tibial slope was at risk of excessive varus of the tibial cut. The hip-knee-ankle angle was ≤179° in 81.4 % and the mechanical axis through Kennedy Zone 2 in 59.3 % of knees. Risk factors for inadequate varus were pre-operative hip-knee-ankle angle >176° and strictly articular varus.
Conclusions: Our results are not as good as previously reported with this technique, but taking into account the factors of failure identified, we could enhance the results.
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| http://dx.doi.org/10.1007/s00264-016-3241-0 | DOI Listing |
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