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3D Biometrics for Hindfoot Alignment Using Weightbearing Computed Tomography.

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Weightbearing computed tomography (WBCT) is effective for assessing hindfoot alignment (HA). Foot ankle offset (FAO) measured via WBCT is reproducible and correlates well with physical examination, aiding HA evaluation.

Keywords:
PedCATTALASfoot ankle offsethindfoot alignmentweightbearing computed tomography

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Area of Science:

  • Orthopedics
  • Radiology
  • Biomechanics

Background:

  • Weightbearing computed tomography (WBCT) is a valuable tool for assessing hindfoot alignment (HA).
  • Foot ankle offset (FAO) is a novel parameter derived from WBCT images using semi-automated software.
  • Evaluating the clinical relevance and reproducibility of FAO for HA assessment is crucial.

Purpose of the Study:

  • To determine the clinical relevance of Foot Ankle Offset (FAO) in evaluating hindfoot alignment (HA).
  • To assess the reproducibility of FAO measurements obtained from Weightbearing Computed Tomography (WBCT) scans.
  • To compare FAO measurements with established methods like the long axial view (HACT).

Main Methods:

  • A prospective comparative study included 249 feet from 126 patients undergoing bilateral WBCT.
  • Patients were categorized into normal (G1), valgus (G2), and varus (G3) hindfoot alignment groups based on clinical assessment.
  • FAO and HACT were measured, and their intra- and interobserver reliability was calculated using intraclass correlation coefficients (ICCs).

Main Results:

  • Mean FAO values differed significantly across groups: 1.2% ± 2.8% (G1), 8.1% ± 3.7% (G2), and -6.6% ± 4.8% (G3).
  • FAO demonstrated excellent intra- (0.987) and interobserver (0.988) reliability.
  • A strong linear correlation (R² = 0.744) was found between FAO and HACT measurements.

Conclusions:

  • Weightbearing computed tomography (WBCT) is a reliable method for characterizing hindfoot alignment (HA).
  • Foot Ankle Offset (FAO) is a reproducible parameter derived from WBCT.
  • FAO measurements correlate well with physical examination findings, supporting its clinical utility in HA assessment.