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Related Experiment Videos

Subtalar joint movement: clinical and computed tomography scan correlation.

T J Pearce1, R E Buckley

  • 1The University of Calgary, Sport Medicine Centre, Alberta, Canada.

Foot & Ankle International
|August 7, 1999
PubMed
Summary

Clinical assessment of subtalar motion significantly overestimates actual joint movement compared to computed tomography (CT) scans. This suggests external measurements are unreliable for documenting subtalar motion.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Medical Imaging

Background:

  • Accurate measurement of subtalar joint motion is crucial for clinical assessment and diagnosis in lower extremity biomechanics.
  • Current clinical methods for assessing subtalar motion may be subject to inaccuracies due to external factors.

Purpose of the Study:

  • To compare subtalar motion measured externally (clinical assessment) with measurements obtained via computed tomography (CT) in healthy individuals.
  • To evaluate the reliability of clinical subtalar motion assessment against a more objective imaging technique.

Main Methods:

  • Ten healthy, recreationally active subjects (20 lower extremities) participated.
  • External subtalar inversion and eversion were measured using a goniometer.
  • Computed tomography (CT) was used to directly measure angular subtalar motion by overlaying joint images in different positions.

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Main Results:

  • CT-measured subtalar motion ranged from 5 to 16 degrees (mean, 11 degrees).
  • External clinical assessment measured subtalar motion between 39 and 54 degrees (mean, 46 degrees).
  • External measurements overestimated CT-derived subtalar motion by approximately three-fold.

Conclusions:

  • The significant discrepancy is likely due to confounding soft tissue and talocrural motion during external clinical examination.
  • Clinical assessment of subtalar motion is unreliable and should not be used for determining or documenting joint movement.
  • Computed tomography (CT) provides a more accurate measure of true subtalar motion.