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Comminuted olecranon fractures: biomechanical testing of locked versus minifragment non-locked plate fixation

  • Orthopaedic Surgery
  • Published:
Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

Open reduction and internal fixation has long been accepted as optimal treatment for displaced olecranon fractures based on poor results seen with conservative management. With the presence of comminution, tension-band wiring constructs are contraindicated due to tendency to compress through fragments, thereby shortening the articular segment. Therefore, plate fixation is typically employed. Our hypothesis was that in a comminuted fracture model, 2.7 mm reconstruction plating without locking screws will perform equally to 3.5 mm locked plating in terms of fracture displacement and rotation (shear).

Materials and methods

A three-part comminuted olecranon fracture pattern was created in nine matched pairs of cadaveric specimen using an oscillating saw in standardized, reproducible fashion. Each matched pair was then randomized to receive either 2.7 mm reconstruction plating or 3.5 mm proximal ulna locked plating. Random allocation software was used to assign the 2.7 mm plate construct to either the right or left side of each pair with the contralateral receiving the 3.5 mm plate construct. Specimens were cyclically loaded simulating passive range of motion exercises commonly performed during rehabilitation. Displacement and rotation in relation to the long axis of the ulna were measured through motion capture. Fragment gapping and rotation was quantified following 100 cycles at 10 N and again following 100 cycles at 500 N.

Results

No significant differences were detected between the 2.7 and 3.5 mm plates in fracture rotation or gapping following loads at 10 N (0.5° and 0.7°; 0.6 and 1.2 mm; respectively; p > 0.05) or 500 N (2.3° and 1.6°; 3.8 and 3.1 mm; respectively; p > 0.05) loading. Fragment rotation and gapping were positively correlated within each plate construct (R 2 > 0.445; p < 0.05).

Conclusions

2.7 mm plating is an alternative to 3.5 mm locked plating with decreased plate prominence without significantly sacrificing displacement and rotational control. This is beneficial in fracture patterns where the traditional dorsal plating does not offer optimal screw trajectory.

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Authors and Affiliations

  1. Orthopaedic Trauma Service, Hospital for Special Surgery, New York Presbyterian Hospital, Weill Cornell Medicine, New York, USA

    David S. Wellman, Nadine C. Pardee, Lionel E. Lazaro, Christopher S. Smith, Dean G. Lorich & David L. Helfet

  2. Department of Biomechanics, Hospital for Special Surgery, New York, NY, USA

    Scott M. Tucker & Josh R. Baxter

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  1. David S. Wellman
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  2. Scott M. Tucker
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  3. Josh R. Baxter
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  4. Nadine C. Pardee
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  5. Lionel E. Lazaro
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  6. Christopher S. Smith
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  7. Dean G. Lorich
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  8. David L. Helfet
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Correspondence to David L. Helfet.

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Wellman, D.S., Tucker, S.M., Baxter, J.R. et al. Comminuted olecranon fractures: biomechanical testing of locked versus minifragment non-locked plate fixation. Arch Orthop Trauma Surg 137, 1173–1179 (2017). https://doi.org/10.1007/s00402-017-2735-6

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  • DOI: https://doi.org/10.1007/s00402-017-2735-6

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