Conference Contribution Details
Mandatory Fields
Hyslop, E., Woodburn, J., McInnes, I.B., Semple, R., Newcombe, L., Hendry, G., Rafferty, D., De Mits, S., Turner, D.E.
International Foot & Ankle Biomechanics Conference (iFAB)
A Reliability Study of Biomechanical Foot Function in Psoriatic Arthritis based on a Novel Multi-Segmented Foot Model - 3.10.3
Seattle, USA
Poster Presentation
Optional Fields
16-SEP-10
18-SEP-10
INTRODUCTION: Psoriatic arthritis (PsA) is an inflammatory joint disease associated with foot-related impairment and disability [1]. The aim of this study was to determine the within-and between-day reliability of spatiotemporal, plantar pressure, kinematic and kinetic measurements based on a novel, seven segment foot model applied in patients with PsA. METHODS: 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. Standard clinical/disease metrics were measured to assess disease status. 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), intraclass correlation coefficients (ICC) and the standard error of measurement (SEM). RESULTS: No change in disease status was observed between time points (p>0.05 for all clinical/disease metrics). Excellent within- and between-day reliability was found for intersegment kinematic and kinetic data patterns with CMC values typically greater than 0.950. Between-day reliability ranged from poor to excellent for absolute CMC values (Figure 1). Corrected CMC values were consistently higher across all variables ranging from fair-to-good to excellent. ICC values indicated excellent reliability for discrete spatiotemporal, plantar pressure, and ankle moment and power variables for both groups. Reliability for ground reaction forces and kinematic discrete variables ranged from fair-to-good to excellent. SEM values ranged from 0.7 to 3.0° for discrete kinematic variables across both groups with greater variability in the PsA patients. DISCUSSION: In disease stable PsA kinetics, spatio-temporal parameters and plantar pressure distribution can be reliably measured. Overall, intersegment kinematic reliability was consistent with that reported elsewhere for healthy and inflammatory arthritis cohorts [2,3]. However, some discrete kinematic variables (absolute values) have poor reliability and should not be used in prospective cohort and intervention studies.
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