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3D biometrics are reliable for measuring hindfoot alignment in pes cavovarus, a new study suggests

A recent study, co-authored by our members Dr Alessio Bernasconi (Royal National Orthopaedic Hospital, Stanmore, UK) and Dr Matthew Welck (Royal National Orthopaedic Hospital, Stanmore, UK) notes that while 3D semi-automatic measurements utilising Weight Bearing CT (WBCT) images have recently been proposed to assess hindfoot alignment, the reliability in pes cavovarus has never been investigated. The aim of this study was therefore to assess intraobserver and interobserver reliability of the foot ankle offset (FAO), calcaneal offset (CO) and hindfoot alignment angle (HAA) in pes cavovarus.


Study Title:

Intraobserver and interobserver reliability of cone beam weightbearing semi-automatic three-dimensional measurements in symptomatic pes cavovarus


Study Authors:

Alessio Bernasconi, Lucy Cooper, Shirley Lyle, Shelain Patel, Nicholas Cullen, Dishan Singh, Matthew Welck.


The study successfully demonstrated that 3D semi-automatic measurements of WBCT images have excellent intra and interobserver reliability in the assessment of hindfoot alignment in pes cavovarus. Aetiology and severity of deformity, and level of seniority do not affect reliability of these measurements.


Study Highlights:

  • 3D biometrics are reliable for measuring hindfoot alignment in pes cavovarus

  • Aetiology of cavovarus didn’t affect reliability of 3D biometrics in our cohort

  • Severity of cavovarus didn’t affect reliability of 3D biometrics in our cohort

  • 3D biometrics proved reliable regardless of level of seniority of the surgeon

  • FAO seems superior to CO and HAA for measuring foot alignment

For more information about the study, please visit the publisher's (Foot and Ankle Surgery) page: https://www.sciencedirect.com/science/article/abs/pii/S1268773119301109