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Related Experiment Videos

Dynamisation of tibial fractures

J B Richardson1, T N Gardner, J R Hardy

  • 1Glenfield General Hospital, Leicester, UK.

The Journal of Bone and Joint Surgery. British Volume
|May 1, 1995
PubMed
Summary

Dynamisation in tibial fracture treatment involves controlled movement. Early cyclic movement occurs with weight-bearing, followed by progressive gap closure after unlocking the fixator.

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering

Background:

  • Tibial fractures require stable fixation to promote healing.
  • Dynamic Axial Fixator allows controlled movement, termed dynamisation.
  • Understanding dynamisation's biomechanical effects is crucial for optimizing fracture healing.

Purpose of the Study:

  • To investigate the biomechanical effects of dynamisation on tibial fractures.
  • To quantify cyclic movement and progressive gap closure during treatment.

Main Methods:

  • Studied six patients with tibial fractures treated with the Dynamic Axial Fixator.
  • Measured early cyclic movement (2-4 weeks) and progressive gap closure (after 6 weeks).
  • Correlated movement with applied load and fracture stiffness.

Main Results:

  • Early peak cyclic movement averaged 0.75 mm (medial) and 0.86 mm (lateral).
  • Movement correlated with load and fracture stiffness.
  • Progressive gap closure averaged 1.3 mm after unlocking the fixator column.

Conclusions:

  • Dynamisation involves distinct phases: early cyclic movement and later progressive closure.
  • Weight-bearing with a locked fixator generates cyclic movement.
  • Unlocking the fixator promotes gap closure, often reducing cyclic movement.

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