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Joint coverage analysis in progressive collapsing foot deformity.

Kassidy Knutson1, Andrew C Peterson1, Rich J Lisonbee1

  • 1Department of Orthopaedics, University of Utah, Salt Lake City, Utah, USA.

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|March 9, 2023
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Summary
This summary is machine-generated.

Progressive collapsing foot deformity (PCFD) involves joint subluxation. Weightbearing CT scans reveal reduced joint coverage in PCFD, particularly in rigid deformities, offering new quantification methods.

Keywords:
adult acquired flatfoot deformityjoint coveragemorphologyweightbearing CT

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Area of Science:

  • Orthopedics
  • Radiology
  • Biomechanics

Background:

  • Progressive collapsing foot deformity (PCFD) involves complex 3D joint subluxation.
  • Conventional radiographs lack detail for precise PCFD assessment.
  • Understanding joint coverage is key to staging PCFD.

Purpose of the Study:

  • To analyze joint coverage in talocrural, subtalar, and Chopart joints using WBCT.
  • To compare joint coverage between PCFD subtypes and controls.
  • To identify radiographic measures for PCFD quantification.

Main Methods:

  • Weightbearing computed tomography (WBCT) scans were used.
  • Ten flexible PCFD, ten rigid PCFD, and 27 control subjects were analyzed.
  • Six articular relationships were assessed for joint coverage.

Main Results:

  • Rigid PCFD showed greatest coverage reduction in the anterior-medial subtalar joint.
  • Increased talonavicular overlap correlated with decreased coverage in tibiotalar, anterior-medial subtalar, and talonavicular joints.
  • Calcaneocuboid joint alignment and coverage lack adequate radiographic quantification.

Conclusions:

  • Significant differences in hindfoot and midfoot joint coverage exist between PCFD patients and controls.
  • WBCT provides detailed joint coverage analysis for PCFD.
  • Identified radiographic measures may improve PCFD quantification in clinical practice.