Is there a correlation between static radiographs and dynamic foot function in pediatric foot deformities?

Area of Science:

• Pediatric Orthopedics
• Biomechanics
• Medical Imaging

Background:

• Common pediatric foot deformities include flexible flatfeet (FFF), congenital clubfeet, and pes cavovarus.
• Clinical assessment of these deformities can be challenging; radiographs aid diagnosis but may not reflect dynamic function.
• Static radiographs may not accurately represent foot skeleton changes during functional activities like walking.

Purpose of the Study:

• To predict dynamic foot movements during walking from static standing radiographs.
• To evaluate the significance of radiographic analysis for assessing pediatric foot function.

Main Methods:

• Retrospective study of pediatric patients (8-17 years) with FFF, recurrent clubfeet (RCF), overcorrected clubfeet (OCCF), and pes cavovarus (PNP).
• Gait analysis using the Oxford Foot Model and standing radiographs (AP and lateral views).
• Multilinear regression analysis to predict gait parameters from radiographic measures.

Main Results:

• Radiography explained the greatest variance in transverse plane forefoot abduction (33% for OCCF, 50% for RCF, 59% for PNP).
• Little to no relation was found for flatfeet and foot kinematics in other planes or between the rearfoot and tibia.
• Static radiographic measures explained only a small amount of variance in walking foot kinematics, especially for FFF.

Conclusions:

• Static radiographic measures have limited ability to predict dynamic foot function during walking.
• Discrepancies may arise because weight-bearing forces in static poses differ from gait forces in magnitude and direction.
• Accurate assessment of pediatric foot function requires more than static radiographic observations.