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Vertical alignment axis for transtibial prostheses: a simplified alignment method.

M C Lin1, Y C Wu, M Edwards

  • 1Department of Physical Medicine and Rehabilitation, College of Medicine, National Taiwan University, Taipei.

Journal of the Formosan Medical Association = Taiwan Yi Zhi
|April 1, 2000
PubMed
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A simplified vertical alignment axis method effectively assesses transtibial prosthesis fit. Proper alignment, indicated by the prosthetic socket center

Area of Science:

  • Prosthetics and Orthotics
  • Biomechanics
  • Rehabilitation Engineering

Background:

  • Transtibial prosthesis fitting requires precise alignment for optimal function.
  • Current alignment methods can be complex and time-consuming.
  • A simplified approach is needed to improve clinical efficiency and patient outcomes.

Purpose of the Study:

  • To evaluate the efficacy of a simplified alignment technique for transtibial prostheses.
  • To determine if the vertical alignment axis method can reliably predict proper prosthesis fit.
  • To assess the relationship between socket alignment and gait deviations.

Main Methods:

  • Measured the vertical projection of the prosthetic socket center relative to the alignment reference center in 36 transtibial prostheses.

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  • Prostheses were fabricated by students and assessed for fit by faculty.
  • Analyzed the spatial distribution of socket centers in relation to the alignment reference center for both properly and improperly fitted prostheses.

    • Main Results:

    • 26 out of 36 (72%) transtibial prostheses were deemed properly fitted by faculty.
    • Properly fitted prostheses showed a tight clustering of the socket center's vertical projection around the alignment reference center (mean 1.3 mm medial, 6.4 mm anterior).
    • Improperly fitted prostheses exhibited significantly greater mediolateral scatter of the socket center's vertical projection (p < 0.001).

    Conclusions:

    • The vertical alignment axis method is a useful and simplified procedure for assessing transtibial prosthesis fit.
    • This method can aid clinicians in understanding prosthesis alignment and identifying gait deviations.
    • Accurate alignment is crucial for preventing gait deviations and ensuring optimal prosthesis function.