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Progressive Collapsing Foot Deformity: Multi-bone Modeling and Joint Level Measurements.

Kassidy Knutson1, Andrew C Peterson1, Rich J Lisonbee1

  • 1Department of Orthopaedics, University of Utah, 590 Wakara Way, Salt Lake City, UT, 84108, USA.

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|July 3, 2025
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Summary
This summary is machine-generated.

Progressive collapsing foot deformity (PCFD) shows quantifiable variations in joint morphology and alignment. Talonavicular joint malalignment may distinguish between PCFD stages, impacting treatment strategies.

Keywords:
Joint Space DistancePrincipal Component AnalysisProgressive Collapsing Foot DeformityStatistical Shape ModelingWeightbearing Computed Tomography

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Medical Imaging

Background:

  • Progressive collapsing foot deformity (PCFD) presents a complex biomechanical challenge.
  • Understanding joint-level changes is crucial for effective management of PCFD.

Purpose of the Study:

  • To characterize joint morphology and alignment differences across PCFD stages.
  • Utilize multi-bone statistical shape modeling (SSM) and weightbearing computed tomography (WBCT) for detailed analysis.
  • Investigate changes in talocrural, subtalar, talonavicular, and calcaneocuboid joints.

Main Methods:

  • Retrospective analysis of 67 patients with PCFD (flexible and rigid) and asymptomatic controls.
  • Weightbearing computed tomography (WBCT) scans were performed on all participants.
  • Multi-bone SSM and joint distance measurements were derived from 3D models.

Main Results:

  • The primary modes of variation in the multi-bone SSM explained 65.6% of the overall population variation.
  • Significant joint space distance differences were found across all three groups and articulations.
  • A medial shift in talar neck alignment was the key difference between flexible and rigid PCFD, worsening peritalar subluxation.

Conclusions:

  • PCFD exhibits quantifiable variability in joint-level morphology and alignment.
  • Talonavicular joint malalignment severity is a potential clinical indicator for differentiating PCFD stages.