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Syndesmotic malreduction may decrease fixation stability: a biomechanical study.

Lu Bai1,2, Wentao Zhang3, Siyao Guan1

  • 1Department of Sports Medicine, Peking University Shenzhen Hospital, #1120 Lianhua Road, Shenzhen, Guangdong Province, China.

Journal of Orthopaedic Surgery and Research
|February 23, 2020
PubMed
Summary

Malreduction of syndesmotic fixation significantly impacts ankle stability, affecting torque resistance and fibular rotation. This study reveals biomechanical insights into poor clinical outcomes associated with syndesmotic malreduction.

Keywords:
Biomechanical stabilityMalreductionSyndesmotic separation

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Area of Science:

  • Orthopedic biomechanics
  • Anatomy and physiology

Background:

  • Syndesmotic injuries can lead to ankle instability.
  • Accurate reduction of the syndesmosis is crucial for restoring ankle function.

Purpose of the Study:

  • To investigate the biomechanical effects of syndesmotic malreduction on ankle stability.
  • To understand the relationship between malreduction and clinical outcomes.

Main Methods:

  • Biomechanical testing on six cadaver legs.
  • Measurements included 3D displacement, fibular rotation, and torque resistance.
  • Tested intact, anatomically reduced, and malreduced syndesmotic models.

Main Results:

  • Malreduction significantly altered torque resistance and fibular rotation under internal and external loads.
  • Significant sagittal and coronal displacements were observed in malreduced specimens compared to intact and anatomical models.
  • Results indicate altered biomechanical stability with malreduction.

Conclusions:

  • Syndesmotic malreduction adversely affects fixation stability.
  • Findings elucidate biomechanical mechanisms underlying poor clinical outcomes in patients with syndesmotic malreduction.
  • Identifies pathological displacement patterns in the ankle under malreduction conditions.