AI Article Synopsis
- The study examines how lateralizing the tibial plateau reference point can improve alignment in patients with preexisting proximal tibia vara undergoing total knee arthroplasty.
- The research included 62 patients and measured mechanical axis deviations, tibia vara angles, and alignment of knee components pre- and post-surgery.
- Results showed that by adjusting the reference point laterally, 94% of patients achieved a favorable postoperative tibiofemoral angle, indicating effective alignment.
Article Abstract
Background: The tibial cut referenced to the center of the intercondylar eminence often leads to varus malalignment in the presence of preexisting proximal tibia vara. The purpose of this study was to investigate the effect of lateralization of the lateral tibial plateau reference point (based on the amount of proximal tibia vara) on the postoperative coronal plane alignment.
Methods: In this prospective cohort study, 62 patients (95 knees) with osteoarthritis and proximal tibia vara underwent primary total knee arthroplasty using a lateral tibial plateau reference point for the extramedullary jig. The pre- and postoperative radiographs were obtained for measurement of mechanical axis deviation, degree of tibia vara, proximal lateral reference point of the tibial condyle, and coronal alignment of the femoral and tibial components. The distance between the tibial reference point and the center of the intercondylar eminence was measured intraoperatively.
Results: The mean tibia vara was 7.1° (standard deviation [SD], 2.3°). The mean lateral displacement of the reference point was 7 mm (SD, 2.2 mm). Postoperative tibiofemoral angle was 6° to 10° of valgus in 94% of cases. There was a strong correlation between the magnitude of tibia vara and the amount of lateralization of the tibial reference point ( = 0.79, < 0.001).
Conclusions: In total knee arthroplasty patients with proximal tibia vara, reasonable accuracy can be achieved with use of the extramedullary jig for tibial component alignment by lateralizing the proximal tibial reference point.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5705304 | PMC |
| http://dx.doi.org/10.4055/cios.2017.9.4.458 | DOI Listing |
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