ArticleArchives of orthopaedic and trauma surgery2025
Accuracy and clinical outcomes in total knee arthroplasty using an image-free navigation system.
Article in Archives of orthopaedic and trauma surgery, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- The use of navigation to achieve planned coronal alignment during cemented revision total knee arthroplasty: a technical note and case series.European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 2025Article
- Article
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
introductionThe purpose of this study was to investigate the accuracy of an image-free navigation system and to investigate the effect of the postoperative coronal lower limb alignment and implant alignment on clinical outcomes following mechanically aligned (MA)-total knee arthroplasty (TKA). MATERIALS AND
methodsIn this retrospective study, 180 primary cemented posterior-stabilized TKAs were performed using an image-free navigation system. Patients were divided into groups based on their postoperative hip-knee-ankle angle (HKA; a neutral HKA group [0 ± 3°] and an outlier group [<-3° or > 3°]), lateral distal femoral angle (LDFA; a neutral LDFA group [90 ± 3°] and an outlier group [< 87° or > 93°]), and medial proximal tibial angle (MPTA; a neutral MPTA group [90 ± 3°] and an outlier group [< 87° or > 93°]). The range-of-motion, 2011 Knee Society score (2011 KSS), and Forgotten Joint Score-12 (FJS-12) were compared between the neutral and outlier groups at 1 and 2 years postoperatively.
resultsThe percentage of knees with a neutral HKA was 91.1% and clinical outcomes significantly improved postoperatively. No significant differences were detected between the neutral HKA (n = 164) and outlier groups (n = 16, all varus) for any clinical outcome. Considering LDFA, the outlier group was too small (n = 3, all varus) for statistical analysis. The overall 2011 KSS and symptoms at 2 years postoperatively and FJS-12 at 1 and 2 years postoperatively were significantly higher in the neutral MPTA group (n = 174) than in the outlier group (n = 6, all varus).
conclusionsThe accuracy of an image-free navigation system was satisfactory in MA-TKA and led to good clinical outcomes. No significant differences in clinical outcome were detected between postoperative patients with an HKA within 3° of the neutral position and postoperative patients with an HKA <-3°. Patients with a postoperative MPTA within 90 ± 3° achieved better clinical outcomes than those of patients with an MPTA < 87°.
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