A reliability study of biomechanical foot function in psoriatic arthritis based on a novel multi-segmented foot model

James Woodburn, Elaine Hyslop, Iain B. McInnes, Ruth Semple, Lisa Newcombe, Gordon Hendry, Danny Rafferty, Sophie De Mits, Deborah Turner

Research output: Contribution to journalArticle


The objective of this study was to determine the within-and between-day reliability of spatio-temporal, plantar pressure, kinematic and kinetic measurements based on a novel, seven segment foot model applied in patients with Psoriatic Arthritis (PsA). Nine PsA patients and matched healthy adult controls underwent three-dimensional gait analysis on two occasions, one week apart using a seven segment foot model. A core-set of functional variables including inter-segment kinematics, kinetics, spatio-temporal and plantar pressure distribution were analysed using the coefficient of multiple correlation (CMC), Bland–Altman plots, intraclass correlation coefficients (ICC) and the standard error of measurement (SEM). Results showed excellent within- and between-day reliability for intersegment kinematic and kinetic data patterns with CMC values typically greater than 0.950 in a clinically stable cohort of PsA patients. Between-day reliability ranged from poor to excellent for absolute CMC values.

Original languageEnglish
Pages (from-to)619-626
Number of pages8
JournalGait and Posture
Issue number4
Publication statusPublished - 1 Oct 2010



  • psoriatic arthritis
  • biomechanics
  • foot function
  • foot model

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