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Related Experiment Videos

A comparative analysis of several crutch-length-estimation techniques.

D M Bauer1, D C Finch, K P McGough

  • 1McDonald Army Hospital, Fort Eustis, VA 23604-5548.

Physical Therapy
|April 1, 1991
PubMed
Summary

Determining optimal crutch length is crucial for patient mobility. This study found that simple height-based calculations, specifically 77% of height or height minus 16 inches, best predict ideal crutch length.

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Rehabilitation Engineering

Background:

  • Proper crutch fitting is essential for patient safety and effective ambulation.
  • Various methods exist for determining crutch length, but their predictive accuracy varies.
  • Standardized and reliable crutch fitting techniques are needed to optimize patient outcomes.

Purpose of the Study:

  • To evaluate and compare the effectiveness of seven different crutch-fitting techniques.
  • To identify the most accurate method for predicting ideal crutch length.
  • To develop a practical tool for estimating correct crutch length.

Main Methods:

  • Seven crutch-fitting techniques were applied to 107 active-duty military volunteers.
  • Measurements included axillary fold to heel, olecranon to fingertip, percentage of height, height minus an offset, percentage of arm span, and arm span minus an offset.

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  • Ideal crutch length was determined by an orthopedic physical therapist; mean squared error indices were calculated to assess prediction accuracy.

    • Main Results:

    • Height-based methods, specifically 77% of height and height minus 16 inches (40.6 cm), demonstrated the highest predictive accuracy.
    • The axilla to heel in supine position method was the least accurate predictor.
    • Linear regression analyses yielded two additional estimates that provided the best overall predictions using both actual and reported height.

    Conclusions:

    • Simple calculations based on a patient's height (77% of height or height minus 16 inches) are effective predictors of ideal crutch length.
    • A quick-reference table derived from regression analyses can aid clinicians in estimating appropriate crutch lengths.
    • These findings can improve the efficiency and accuracy of crutch fitting in clinical practice.