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Effect of the lower limb rotational alignment on tibiofemoral contact pressure

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

The effect of the rotational alignment of lower extremities on the tibiofemoral contact mechanics is not known. This study was designed to measure the contact area and pressure within medial and lateral tibiofemoral compartments following controlled serial rotational deformities through femoral and tibial shafts.

Methods

Eight lower extremities of fresh frozen cadavers were used. Computed tomography was conducted to measure the rotational profile of the lower extremities. Through a medial parapatellar arthrotomy, pressure sensors were implanted into both tibiofemoral compartments. Femoral and tibial mid-shaft osteotomies were performed and stabilized by non-locked intramedullary nails and external fixators in neutral rotation. The contact area and pressure were measured under axial loading in neutral rotation and following serial malrotations from 40° external to 40° internal malrotation in 10° increments.

Results

Contact area was not affected by malrotations. Medial compartment contact pressure rose with external and decreased with internal malrotations whether femoral or tibial (P < 0.0001) while lateral pressure was not affected. When correlated with the cadavers’ original rotational profile, decreased femoral neck anteversion was associated with increased medial pressure up to 28.5% at 20° of retroversion while it decreased with increased anteversion. On the other hand, decreased tibial torsion angle was associated with decreased medial pressure up to −32% at 10° of internal torsion and it increased with excessive external torsion. Furthermore, there was a strong positive correlation with the total rotational alignment as measured by the neck malleolar angle.

Conclusion

A significant interaction could be detected between the rotational alignment of the lower extremity and medial tibiofemoral compartment contact pressures.

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Acknowledgments

The study was supported by a grant from the Association for Orthopaedic Research (AFOR). We would like to thank Dr. Markus Ozwald for his assistance and discussions. We would also like to thank Dr. Timm Kirchoff, from the Radiology Department, Hannover Medical School, for his assistance in performing computed tomography studies for our Cadavers.

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Authors and Affiliations

  1. Trauma Department, Hannover Medical School, Carl-Neuberg-Street 1, 30625, Hannover, Germany

    Mohamed Kenawey, Emmanouil Liodakis, Christian Krettek, Tatiana Horn & Stefan Hankemeier

  2. Orthopaedic Department in Annastift, Hannover Medical School, Anna-von-Borries-Straße 3, 30625, Hannover, Germany

    Sven Ostermeier

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  1. Mohamed Kenawey
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  2. Emmanouil Liodakis
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  3. Christian Krettek
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  4. Sven Ostermeier
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  5. Tatiana Horn
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  6. Stefan Hankemeier
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Correspondence to Mohamed Kenawey.

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Kenawey, M., Liodakis, E., Krettek, C. et al. Effect of the lower limb rotational alignment on tibiofemoral contact pressure. Knee Surg Sports Traumatol Arthrosc 19, 1851–1859 (2011). https://doi.org/10.1007/s00167-011-1482-4

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  • DOI: https://doi.org/10.1007/s00167-011-1482-4

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