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Locking-plate osteosynthesis versus intramedullary nailing for fixation of olecranon fractures: a biomechanical study

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Abstract

Purpose

Intramedullary nailing and locked plating for fixation of olecranon fractures has recently gained popularity. However, these two new technologies have not been compared for their biomechanical efficacy. The aim of this study was to evaluate the biomechanical stability of two newly designed fracture fixation devices for treating olecranon fractures during dynamic continuous loading: the ION intramedullary locking nail and the LCP precontoured locking compression plate.

Methods

Simulated oblique olecranon fractures were created in eight pairs of fresh-frozen cadaver ulnae and stabilised using either the LCP or ION. Specimens were then subjected to continuous dynamic loading (from 25 to 200 N), with a continuous angle alteration between 0° and 90° of flexion, to perform a matched-pairs comparison. Significant differences in the distance between markers surrounding the fracture gap was determined using the Wilcoxon test after four and 300 loading cycles.

Results

The ION resulted in significantly less displacement in the fracture gap at 0° extension (P = 0.036), 45° flexion (P = 0.035) and 90° flexion (P = 0.017) after 300 cycles of continuous loading. The measured displacements were small and were probably not of clinical significance. No mechanical failure or hardware migration was seen with either fixation technique.

Conclusion

This study shows significantly less micromotion for the ION than for the LCP in treating oblique olecranon fractures after 300 cycles of dynamic loading. Both implant types could be appropriate surgical techniques for fixation of selected olecranon fractures and osteotomies.

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Conflict of interest

No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this study by any of the authors. The biomechanical laboratory of the Department of Trauma Surgery of the Johannes Gutenberg University Mainz is supported by a yearly grant of Synthes, Bettlach, Switzerland. The ION prototypes were donated by Synthes, Bettlach, Switzerland.

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Authors and Affiliations

  1. Department of Trauma Surgery, Center for Musculoskeletal Surgery, Johannes Gutenberg University Mainz, Langenbeckstrasse 1, 55131, Mainz, Germany

    Tobias E. Nowak, Torsten Andres, Sven O. Dietz, Daniela Klitscher & Pol M. Rommens

  2. Department of Trauma Surgery, University of Cologne, Cologne, Germany

    Klaus J. Burkhart & Lars P. Mueller

Authors
  1. Tobias E. Nowak
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  2. Klaus J. Burkhart
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  3. Torsten Andres
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  4. Sven O. Dietz
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  5. Daniela Klitscher
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  6. Lars P. Mueller
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  7. Pol M. Rommens
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Correspondence to Tobias E. Nowak.

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Nowak, T.E., Burkhart, K.J., Andres, T. et al. Locking-plate osteosynthesis versus intramedullary nailing for fixation of olecranon fractures: a biomechanical study. International Orthopaedics (SICOT) 37, 899–903 (2013). https://doi.org/10.1007/s00264-013-1854-0

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  • DOI: https://doi.org/10.1007/s00264-013-1854-0

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