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A system for the analysis of foot and ankle kinematics during gait

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4 Author(s)
Kidder, S.M. ; Dept. of Biomed. Eng., Marquette Univ., Milwaukee, WI, USA ; Abuzzahab, F.S., Jr. ; Harris, G.F. ; Johnson, J.E.

A five-camera Vicon (Oxford Metrics, Oxford, England) motion analysis system was used to acquire foot and ankle motion data. Static resolution and accuracy were computed as 0.86±0.13 mm and 98.9%, while dynamic resolution and accuracy were 0.1±0.89 and 99.4% (sagittal plane). Spectral analysis revealed high frequency noise and the need for a filter (6 Hz Butterworth low-pass) as used in similar clinical situations, A four-segment rigid body model of the foot and ankle was developed. The four rigid body foot model segments were (1) tibia and fibula, (2) calcaneus, talus, and navicular, (3) cuneiforms, cuboid, and metatarsals, and (4) hallux. The Euler method for describing relative foot and ankle segment orientation was utilized in order to maintain accuracy and ease of clinical application. Kinematic data from a single test subject are presented

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Rehabilitation Engineering, IEEE Transactions on  (Volume:4 ,  Issue: 1 )