Validation of the foot profile score

Area of Science:

• Biomechanics
• Orthopedics
• Gait Analysis

Background:

• Existing static foot posture measures are numerous, but a validated score for dynamic foot motion is lacking.
• Three-dimensional gait analysis with multi-segment foot models like the Oxford Foot Model (OFM) quantifies kinematic deviations but lacks a summary score.

Purpose of the Study:

• Introduce and validate the Foot Profile Score (FPS), a novel summary score for dynamic foot motion.
• Assess the FPS's properties, design, and correlation with clinical foot deformity assessments.

Main Methods:

• Concurrent validity was assessed by correlating the FPS with the Clinical Foot Deformity Score (CFDS) in 60 subjects.
• Content validity was established using multiple regression of CFDS on the six Foot Variable Scores (FVS) comprising the FPS.
• Predictive validity was examined by comparing the FPS and Gait Profile Score (GPS) in subjects with global limb involvement versus isolated foot deformity.

Main Results:

• A significant Pearson correlation (r=0.62, p<0.001) was found between the FPS and CFDS.
• The six FVS positively predicted CFDS (R²=0.456, p<0.001), with FPS contributing independently.
• A significant correlation (r=0.64, p<0.001) existed between FPS and GPS in the global involvement group, but not in the isolated foot deformity group (r=0.08, p=0.54).

Conclusions:

• The Foot Profile Score (FPS) is the first validated score for quantifying dynamic foot motion.
• The FPS demonstrates validity and potential for clinical application in assessing foot deformities during gait.