Abstract
A unique light emitting diode (LED) based active marker system was developed to track the three dimensional motion of the pediatric foot and ankle. The marker system was used with a six-camera Vicon VX (Oxford Metrics, Oxford, U.K) motion analysis system which was integrated with a three-segment biomechanical model to describe the complex multiplanar motion of the tibia, hindfoot and forefoot. The average static resolution (0.38 mm) and accuracy (99.12%) obtained with this system was better than that obtained with the authors' comparable adult foot and ankle system. Spectral analysis revealed a distinct 30 Hz component due to video interlacing. Dynamic testing of this system has confirmed that further clinical trials are supported and feasible.
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