Abstract
Purpose
Intraoperative fracture of the lateral cortex fractures of the tibia is a potential complication of high tibial osteotomy (HTO), which may result in inadequate rotational alignment of the distal tibia. Our aim was to determine how rotational malalignment of the distal tibial segment distal would affect intraarticular contact pressure distribution in the knee and ankle joints.
Methods
A medial, L-shaped opening-wedge HTO was performed on seven human lower body specimens. A stainless steel device with integrated load cell was used to axially load the leg. Pressure-sensitive sensors were used to measure intraarticular contact pressures. Intraoperative changes in alignment were monitored in real time using computer navigation. Measurements were performed in the native knee alignment, after 10° and 15° of alignment correction and with the distal tibia fixed at 15° of external rotation.
Results
Moderate-to-large alignment changes after medial opening-wedge HTO resulted in a shift in intraarticular contact pressures from the medial compartment of the knee towards the lateral compartment. However, fixation of the distal tibial segment at 15° of external rotation neutralized this intended beneficial effect. In the ankle, external rotation of the distal tibia also caused a reduction in contact pressures and tibiotalar contact area.
Conclusion
Malrotation of the distal tibial fragment negates the intended effect of offloading the diseased compartment of the knee, with the contact pressures remaining similar to those of the native knee. Furthermore, malrotation leads to abnormal ankle contact pressures. Care should be taken to ensure appropriate rotational alignment of the distal tibial segment during intraoperative fixation of HTO procedures.
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Acknowledgments
None of the authors have any professional or financial affiliations that could have biased this study. Funding awarded by the German Research Foundation (DFG) was used to construct the device used for axially loading the limb and the computer interface used to monitor changes in the knee joint during the experiments. Funding awarded by the Robert Mathys Foundation (RMS) was used for all materials required for performing the surgeries and for performing ankle measurements.
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Eduardo M. Suero and Nael Hawi have contributed equally to this work.
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Suero, E.M., Hawi, N., Westphal, R. et al. The effect of distal tibial rotation during high tibial osteotomy on the contact pressures in the knee and ankle joints. Knee Surg Sports Traumatol Arthrosc 25, 299–305 (2017). https://doi.org/10.1007/s00167-015-3553-4
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DOI: https://doi.org/10.1007/s00167-015-3553-4