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Alignment of trans-tibial prostheses based on roll-over shape principles.

A H Hansen1, M R Meier, M Sam

  • 1Department of Physical Medicine and Rehabilitation, Northwestern University, Feinberg School of Medicine, Chicago, IL, USA.

Prosthetics and Orthotics International
|October 24, 2003
PubMed
Summary

Prosthetic feet alignment can be optimized by matching their roll-over shape to an ideal, able-bodied model. This computational approach ensures effective prosthetic alignment, improving outcomes for users.

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Area of Science:

  • Biomechanics
  • Prosthetics and Orthotics
  • Biomedical Engineering

Background:

  • The roll-over shape alignment hypothesis suggests prosthetic feet should mimic the ideal shape of an able-bodied foot-ankle system.
  • Current prosthetic alignment methods may not consistently achieve optimal foot roll-over shapes.

Purpose of the Study:

  • To investigate the roll-over shape alignment hypothesis for prosthetic feet.
  • To develop and evaluate a computational alignment system for trans-tibial prostheses based on this hypothesis.

Main Methods:

  • Developed a computational alignment system to set trans-tibial alignments based on the roll-over shape hypothesis.
  • Compared roll-over shapes of three prosthetic feet aligned by the system, standard clinical techniques, and a prosthetist team.

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  • Assessed alignment using both computational system and manual prosthetist alignment, with a control group receiving no specific alignment.

    • Main Results:

    • No significant difference was found between the computational system's alignment and standard clinical techniques (p = 0.944).
    • Significant differences were observed between unaligned prostheses and those aligned by prosthetists (p = 0.006) or the computational system (p = 0.024).
    • Results support the hypothesis that matching prosthetic foot roll-over shape to an ideal is the primary goal of alignment.

    Conclusions:

    • The roll-over shape alignment hypothesis is supported by the study's findings.
    • A computational system can achieve alignment comparable to clinical standards, validating the hypothesis.
    • Using an ideal roll-over shape as an alignment goal may enable pre-fabrication (a priori) alignment, potentially reducing hardware needs and benefiting low-income settings and lightweight prosthesis development.