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Does the type of medial plate fixation matter for supplemental fixation of distal femur fractures manage with a lateral pre-contoured locked plate? A Biomechanical study

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European Journal of Orthopaedic Surgery & Traumatology Aims and scope Submit manuscript

A Correction to this article was published on 11 October 2023

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Abstract

Introduction

Fixation of distal femur fractures with a lateral pre-contoured locking plate provides stable fixation and is the standard treatment in most cases, allowing early range of motion with a high rate of union. However, in situations, the stability achieved with the lateral plate alone may be insufficient, predisposing to fixation failure. The objective of the study was to compare, in synthetic bone models, the biomechanical behaviour of the fixation with a distal femur lateral pre-contoured locking plate solely and associated with a 3.5 mm proximal humeral locking plate applied upside down or a 4.5 mm helical locking compression plate on the medial side.

Material and methods

A total of 15 solid synthetic left femur samples were used. A metaphysical defect at the level of the medial cortex was simulated. The samples were randomly distributed into three groups equally. All groups received a 4.5/5.0 mm single lateral 9-hole distal femur lateral pre-contoured locking plate. Group 1 had no supplementary plate. Group 2 received a supplementary 6-hole 3.5 mm proximal humeral locking plate and Group 3 received a supplementary 4.5/5.0 mm helical 14-hole narrow locking compression plate.

Results

Both supplementary plate types used in groups 2 and 3 contributed to increase the apparent stiffness of the construct, but pairwise comparison showed statically significant difference only between group 1 and 3. No significant difference was observed between groups 2 and 3.

Conclusion

Both supplementary plates might be considered for improving the fixation in distal femur fracture in selected cases.

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Availability of data and material

All data generated and analysed during this study are included in this published article and are available from the corresponding author on reasonable request.

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Acknowledgements

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Funding

This study was fully supported by the AO Trauma Latin America.

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All authors contributed to the study's conception and design. Material preparation, data collection, and analysis were performed by Sebastian Pereira, Ricardo Mariolani and William Belangero. Sebastian Pereira wrote the first draft of the manuscript and all authors commented on previous version of the manuscript. Vincenzo Giordano and Sebastian Pereira wrote the revision of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Sebastián Pereira.

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Pereira, S., Bidolegui, F., Garabano, G. et al. Does the type of medial plate fixation matter for supplemental fixation of distal femur fractures manage with a lateral pre-contoured locked plate? A Biomechanical study. Eur J Orthop Surg Traumatol 34, 605–612 (2024). https://doi.org/10.1007/s00590-023-03685-w

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