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Related Experiment Videos

Lower limb intersegmental forces for below-knee amputee children during standing.

J R Engsberg1, K C Aldridge, J A Harder

  • 1Human Performance Laboratory, Faculty of Physical Education, University of Calgary, Canada.

Prosthetics and Orthotics International
|December 1, 1991
PubMed
Summary

Below-knee amputee (BKA) children experience different knee and hip forces and spatial orientations during standing compared to able-bodied children. These forces, while significant, are lower than during walking or running.

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Area of Science:

  • Biomechanics
  • Pediatric Orthopedics
  • Prosthetics

Background:

  • Understanding the biomechanical demands on children with lower-limb differences is crucial for optimizing prosthetic design and rehabilitation.
  • Limited research exists on the specific joint forces and spatial orientations in below-knee amputee (BKA) children during static activities like standing.

Purpose of the Study:

  • To compare intersegmental knee and hip forces in unilateral below-knee amputee (BKA) children and able-bodied children during standing.
  • To analyze spatial orientation differences between BKA and able-bodied children during standing.

Main Methods:

  • A static force analysis was employed using external force and spatial data collected from three BKA children and ten able-bodied children (aged 7-9 years).
  • Data were gathered over four sessions at six-month intervals to capture longitudinal changes.

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  • Intersegmental forces at the knee and hip joints were calculated for both groups.

    • Main Results:

    • Significant differences in intersegmental knee and hip forces were observed between BKA and able-bodied children during standing, with some forces being greater and others lower in the BKA group (p < 0.05).
    • Despite differences, all measured forces were substantially lower than those recorded during walking or running.
    • BKA children exhibited greater frontal plane prosthetic knee angle, sagittal plane prosthetic and non-prosthetic knee angles, and sagittal plane trunk angle compared to able-bodied peers.

    Conclusions:

    • Below-knee amputee children demonstrate altered intersegmental joint forces and spatial orientations during standing compared to their able-bodied counterparts.
    • These biomechanical variations may stem from the anatomical structure of the amputee limb and/or the characteristics of the prosthesis used.
    • Further research is warranted to explore the long-term implications of these findings on joint health and functional mobility in pediatric amputees.