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Related Experiment Video

Updated: Apr 16, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
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In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

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A novel technique using sensor-based technology to evaluate tibial tray rotation.

Martin W Roche, Leah C Elson, Christopher R Anderson

    Orthopedics
    |March 12, 2015
    PubMed
    Summary

    Using the tibial tubercle to guide total knee arthroplasty (TKA) rotation is highly variable. This method resulted in significant tibiofemoral incongruency in over half of patients, highlighting its inconsistency for optimal surgical outcomes.

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    Area of Science:

    • Orthopedic surgery
    • Biomechanical engineering
    • Medical device technology

    Background:

    • Accurate rotational alignment of the tibial component is crucial for successful total knee arthroplasty (TKA).
    • Current methods for tibial component rotation lack validated techniques, leading to potential malalignment.
    • The midmedial third of the tibial tubercle is a suggested intraoperative reference point to mitigate rotational outliers.

    Purpose of the Study:

    • To quantify the variability and consistency of using the midmedial third of the tibial tubercle as a reference for tibial component rotation in TKA.
    • To assess the impact of this referencing technique on achieving tibiofemoral congruency in extension.

    Main Methods:

    • Intraoperative sensor data from 170 primary TKA patients were analyzed.

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    Last Updated: Apr 16, 2026

    In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
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  • Tibial component rotation was evaluated in real-time using sensor-equipped trial inserts.
  • Tibiofemoral congruency was assessed in extension, with initial and final rotation angles recorded.

    • Main Results:

    • 53% of patients exhibited asymmetric tibiofemoral congruency when referencing the tibial tubercle.
    • Of those with asymmetry, 68% had excessive internal rotation and 32% had excessive external rotation.
    • The average deviation from neutral rotation was 6°, with a range of 0.5° to 19.2°.

    Conclusions:

    • Referencing the midmedial third of the tibial tubercle for tibial component rotation in TKA demonstrates high variability.
    • This method is inconsistent in achieving optimal tibiofemoral congruency and may lead to significant rotational malalignment.
    • Alternative or supplementary methods are needed for reliable tibial component rotational positioning in TKA.