Biomechanical analysis of lower limbs for children with cerebral palsy: Gait analysis and musculo-skeletal modelling

Abstract

s of the 17th Annual Meeting of ESMAC, Oral Presentations / Gait & Posture 28S (2008) S1–S48 S13 reconstructions in standing position were provided, by applying non linear deformation on 3D muscles in lying position, based on skeletal architecture. Muscle-tendon length ratio was then calculated based on specific subject muscles insertion areas on skeletal segments. Patients/Materials and Methods: An asymptomatic database for gait parameters was established to allow gait analysis data interpretations of patients with CP. Uncertainties on gait parameters were quantified. Specific subject 3D reconstructions of skeletal lower limbs in standing position were done. Skeletal malalignment was quantified by calculating clinical parameters. Uncertainties were less than 5o for most of them except for tibial torsion. Specific subject lower limbs were matched with gait analysis frames allowing display of bone movement during walking. Hip center calculated by the gait protocol was behind the femoral head center in static and dynamic trials (3.7 cm). Specific subject 3D reconstructions of 19 muscles were obtained for each lower limb side. Volumes, PCSA and lengths were calculated. Losses of muscle volumes were found and evaluated for the CP patient as compared to healthy subjects. Muscles were reconstructed in standing position. Muscle-tendon length ratios were lower for the CP patient as compared to the healthy children. Left: subject specific 3D reconstruction of lower limbs. Right: Bones 3D reconstructions.