Abstract
Purpose
Patellar maltracking due to incorrect component alignment is considered as a main reason for anterior knee pain after total knee arthroplasty (TKA). In contrast to coronal and axial component placement, the influence of sagittal component alignment on patellar kinematics has not been investigated so far.
Methods
In ten lower cadaveric limbs, TKAs were implanted using a commercial computer navigation system. In six knees, the femoral component was aligned in 5° and in four knees in 0° of flexion, respectively. Patellar kinematics were registered by means of a computer navigation system using an additional patella tracking array and correlated with femoral and tibial sagittal component alignment.
Results
Sagittal component alignment significantly altered patellar mediolateral shift (p < 0.05). In contrast, patellar epicondylar distance, rotation and tilt were not significantly influenced.
Conclusions
Sagittal component alignment in TKA has a major impact on patellar kinematics and should therefore be considered while addressing tibiofemoral kinematics intraoperatively.
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No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article.
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The work was performed at the Department of Orthopedic Surgery at the Medical University of Regensburg/Germany.
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Keshmiri, A., Springorum, H.R., Baier, C. et al. Changes in sagittal component alignment alters patellar kinematics in TKA: an in vitro study. Knee Surg Sports Traumatol Arthrosc 24, 823–829 (2016). https://doi.org/10.1007/s00167-016-4004-6
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DOI: https://doi.org/10.1007/s00167-016-4004-6