A reproducible reference point for the common peroneal nerve during surgery at the posterolateral corner of the knee: a cadaveric study

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Abstract

Background: This is an experimental study conducted to assess whether the fibular head is a reliable reference point to identify the position of the common peroneal nerve at the posterolateral corner of the knee. Materials and methods: Twelve cadaveric knees were dissected through the lateral approach. The common peroneal nerve was identified and traced. The location where the common peroneal nerve crossed the posterior border of the biceps femoris and the posterior border of the fibular neck were designated as points B and N, respectively. The tip of the fibular head was designated F. Distances FB and FN were measured and the triangular area FBN was calculated at various degrees of knee flexion. Results: During knee motion, distance FN showed minimal change and was not affected by variation in degrees of knee flexion (p = 0.131). Distance FB and distance BN were affected by variation in degrees of knee flexion (p < 0.001). Triangular area FBN increased in size up to 60° of knee flexion measuring 621.22 mm2 and subsequently decreased with further knee flexion. Conclusion: The common peroneal nerve can consistently be found at approximately 20.7 ± 1 mm on the fibular neck with respect to the tip of the fibular head. The tip of the fibular head is a consistent landmark that can be used to predict the position of the exit point of the common peroneal nerve at the posterolateral corner of the knee.

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Teo, H. L. T., Ang, K. X. M., & Loh, S. Y. J. (2020). A reproducible reference point for the common peroneal nerve during surgery at the posterolateral corner of the knee: a cadaveric study. Knee Surgery and Related Research, 32(1). https://doi.org/10.1186/s43019-020-00039-2

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