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Related Experiment Videos

The forces which develop in the tissues during leg lengthening. A clinical study

A H Simpson1, J L Cunningham, J Kenwright

  • 1Nuffield Department of Orthopaedic Surgery, Nuffield Orthopaedic Centre, Headington, Oxford, UK.

The Journal of Bone and Joint Surgery. British Volume
|November 1, 1996
PubMed
Summary

During limb lengthening, axial forces vary by pathology. High forces in congenital cases correlate with increased complications like angular deformity due to external fixation failure.

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Biomaterials

Background:

  • Limb lengthening procedures aim to correct discrepancies but can subject tissues to significant mechanical forces.
  • Understanding these axial forces is crucial for optimizing treatment and minimizing complications.

Purpose of the Study:

  • To measure and analyze axial forces during limb lengthening across different patient pathologies.
  • To correlate measured forces with soft tissue response and complication rates.

Main Methods:

  • Axial forces were measured in ten patients undergoing limb lengthening.
  • Patients presented with varied underlying pathologies, including post-traumatic shortening and congenital limb shortening.

Main Results:

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  • Force patterns differed based on pathology: post-traumatic shortening showed steady force increases (up to 300 N).
  • Congenital shortening resulted in very high peak forces (>1000 N) and significant force relaxation (400-500 N).
  • Higher recorded forces were associated with increased complication rates, notably angular deformity due to external fixation frame failure.

    • Conclusions:

    • Axial force dynamics during limb lengthening are pathology-dependent.
    • Excessive forces, particularly in congenital cases, increase the risk of complications like angular deformity.
    • Monitoring and managing axial forces are critical for successful limb lengthening outcomes.