Can static foot posture measurements predict regional plantar surface area?

Area of Science:

• Biomechanics
• Podiatry
• Orthopedics

Background:

• Assessing foot posture is crucial for understanding foot function.
• Static foot measurements are commonly used but their predictive power for dynamic plantar surface area is not fully understood.

Purpose of the Study:

• To determine if static foot posture measurements can predict plantar surface area in the rearfoot, midfoot, and forefoot.
• To investigate the predictive capability of single or combined static foot measurements.

Main Methods:

• Collected 12 static foot measurements from 52 individuals.
• Classified subjects into pronated or normal foot mobility groups based on midfoot width changes.
• Utilized stepwise regression analysis to identify predictors of regional plantar surface area during walking.

Main Results:

• A two-variable model accurately predicted forefoot plantar contact area (R²=0.79, p<0.0001).
• A four-variable model predicted midfoot plantar contact area (R²=0.85, p<0.0001) in individuals with significant midfoot mobility.

Conclusions:

• Simple, reliable, and time-efficient static foot measurements can explain a significant portion of forefoot (79%) and midfoot (85%) plantar surface area.
• Clinicians can leverage these findings for effective assessment of foot posture and plantar loading.