Abstract
The pivot shift is a dynamic test of knee laxity which correlates with subjective sensations of knee instability. As the knee flexes from full extension, the tibia subluxes, both in anterior translation and internal rotation, so that the lateral femoral condyle moves ‘downhill’ to the posterior edge of the tibial plateau under the influence of the compressive joint load. With further knee flexion, the tension in the iliotibial tract eventually overcomes the load which has maintained the subluxation and then the tibia is suddenly reduced to its anatomical articulation. Thus, the envelope of laxity of the pivot shift shows a pattern of simultaneous gradual pathological anterior translation and internal rotation, occurring over approximately 35° of knee flexion, followed by a relatively sudden reduction, which is a falling back posteriorly and externally to the anatomical position. It is desirable to measure both tibial translations and rotations to understand each injured knee, because differing patterns of injury may explain the wide range of tibiofemoral movements, such as the relative amount of tibial translation versus rotation, that have been reported during the pivot shift.
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Lord, B., Amis, A.A. (2017). The Envelope of Laxity of the Pivot Shift Test. In: Musahl, V., Karlsson, J., Kuroda, R., Zaffagnini, S. (eds) Rotatory Knee Instability. Springer, Cham. https://doi.org/10.1007/978-3-319-32070-0_18
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DOI: https://doi.org/10.1007/978-3-319-32070-0_18
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