Foot Build Registration System and CMT

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Foot Ankle Surg. 2009;15(3):127-32.

Foot Build Registration System (FBRS) to evaluate foot posture: a reliability

study with healthy subjects and patients with Charcot-Marie-Tooth disease.

Tuinhout M, PG, Louwerens JW.

Sint Maartenskliniek, Department of Orthopaedic Surgery, Foot and Ankle

Reconstruction Unit, P.O. Box 9011, 6500 GM Nijmegen, The Netherlands.

BACKGROUND: To follow the weight bearing foot posture in subjects, a measurement

tool using digital photography was developed, Foot Build Registration System

(FBRS) (Fig. 1) [M. Van der Cruijsen, Voetvorm registratie systeem, Boxmeer

(1999).]. This study's objective was to investigate the reproducibility of FBRS

measurements in healthy feet and feet of patients with Charcot-Marie-Tooth

disease (CMT).

METHODS: Reproducibility and reliability studies were performed in several foot

views in healthy and CMT patients.

RESULTS: These studies showed that the variability of the 95% prediction limit

depended upon the foot view being studied and whether markers had been drawn.

Some individuals had a higher intra-individual variability than others. Limiting

data collection to those individuals with a SD <3.5 degrees for a series of five

or more photographs per view improved the 95% prediction limits. These varied

between 2.8 degrees and 7.7 degrees .

CONCLUSIONS: If the differences found between registration are greater than the

above mentioned, values can be attributed to time or operative management for

healthy and CMT patients and not to measurement error.