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Related Experiment Videos

Do axial dynamic fixators really produce axial dynamization?

C B Howard1, A Simkin, Y Tiran

  • 1Department of Orthopaedic and Traumatic Surgery, Hadassah University Hospital, Jerusalem, Israel. charles@inter.net.il

Injury
|July 9, 1999
PubMed
Summary
This summary is machine-generated.

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Dynamic external fixators, used for long bone fractures, may not provide true axial dynamization. Bending moments from bone pins cause "self-locking," preventing intended micromovements at the fracture site.

Area of Science:

  • Orthopedics
  • Biomedical Engineering
  • Biomechanics

Background:

  • Dynamic external fixators are commonly used for long bone fracture treatment.
  • Dynamization, involving micromovements at the fracture site, is a claimed benefit of these devices.
  • The mechanism involves sliding of an inner rod within an outer housing.

Purpose of the Study:

  • To investigate the effect of bending moments on the binding properties of the Orthofix dynamic external fixator system.
  • To measure the extent of movement at a simulated fracture site before self-locking occurs.
  • To discuss the implications of these findings for true axial dynamization.

Main Methods:

  • Studied the Orthofix dynamic external fixator system.
  • Simulated a fracture site to measure movement.

Related Experiment Videos

  • Quantified the amount of axial movement before the system self-locked due to bending moments.

    • Main Results:

    • Forces transferred from bone via pins create a bending moment on the fixator.
    • This bending moment leads to "self-locking" of the fixator.
    • The Orthofix system demonstrated limited axial movement before locking, suggesting true dynamization is not achieved.

    Conclusions:

    • The bending moment inherent in dynamic external fixator systems can prevent the intended axial micromovements.
    • The Orthofix system, under tested conditions, does not appear to provide true axial dynamization.
    • Clinical implications regarding the efficacy of dynamization in fracture healing with this system warrant further consideration.