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- Title
Less femoral lift-off and better femoral alignment in TKA using computer-assisted surgery.
- Authors
Kim, Seong; Lee, Han-Jun; Jung, Ho-Joong; Lee, Jae; Kim, Ki
- Abstract
Purpose: A comparison has been made between navigation-assisted and conventional measured resection total knee arthroplasty (TKA), under the hypothesis that navigation assistance would improve the precision and consistency of component alignment and femoral component rotation. Methods: The following radiographic parameters were measured: mechanical femorotibial angle, coronal and sagittal component angle, and femoral component rotation. Femoral condylar lift-off was checked by axial radiographs, and thresholds for outliers were set at 1.0 mm. Results: Clinical results obtained using Knee Society and Hospital for Special Surgery systems were not statistically different. The mean mechanical femorotibial angle was 2.2° (SD: 0.9) in the conventional group and 1.7° (SD: 0.7) in navigation group ( p = 0.001). The mean coronal femoral component angle was 89.2° (SD: 2.2) in conventional group and 90.4° (SD: 1.8) in navigation group ( p = 0.006). The mean transepicondylar-posterior condylar axis angle was 1.7° (SD: 0.9) in conventional group and 1.2° (SD: 0.5) in navigation group ( p = 0.008). Femoral condylar lift-off greater than 1 mm occurred more frequently ( p = 0.000) in conventional group. Conclusion: Coronal plane stability and precision of femoral component rotation were impacted by navigation system. The use of a navigation system with measured resection TKA can help optimize coronal stability and parallel component position. Level of evidence: Retrospective case control study, Level IV.
- Subjects
TOTAL knee replacement; SURGICAL excision; COMPUTER-assisted surgery; MEDICAL radiography; STATISTICAL hypothesis testing; RETROSPECTIVE studies
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2013, Vol 21, Issue 10, p2255
- ISSN
0942-2056
- Publication type
Article
- DOI
10.1007/s00167-012-2230-0