title: Biomechanical behavior of valgus foot in children with cerebral palsy: A comparative study.
abstract: Valgus foot (VF) is the most common foot deformity in children with cerebral palsy (CP), which seriously affects the foot balance in standing and posture control in walking. Little information about the locus and stress of internal bones was available. To accurately describe the biomechanical behavior of the internal bones of VF in CP, we compared the locus and stress of internal bones between the normal foot (NF) and VF by finite element models. Compared with the NF, displacement of the talus and navicular drop in VF increased by 109% and 171% in vertical direction respectively, and the locus of talus had a tendency to clockwise rotation and downward movement in coronal plane. In addition, the abduction angle of forefoot in VF increased up to 10.3°, which was twice more than that in the NF. Moreover, the lateral metatarsophalangeal joints were upward tilted 6.3° comparing with touchdown posture of NF, and peak von Mises stress of the internal bones in VF model concentrated on the fourth metatarsal. The simulation showed that locus of the forefoot, downward rotation of talus head and navicular drop were meaningful to quantify the collapse of medial longitudinal arch. It would provide some suggestions to the rehabilitation treatments of the CP children's VF.
authors.affiliation: Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China; State Key Lab of Virtual Reality Technology and Systems, Beihang University, Beijing 100191, China.
authors.forename: Junchao
authors.initials: J
authors.lastname: Guo
authors.affiliation: Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China; State Key Lab of Virtual Reality Technology and Systems, Beihang University, Beijing 100191, China.
authors.forename: Lizhen
authors.initials: L
authors.lastname: Wang
authors.affiliation: Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China; State Key Lab of Virtual Reality Technology and Systems, Beihang University, Beijing 100191, China.
authors.forename: Zhongjun
authors.initials: Z
authors.lastname: Mo
authors.affiliation: Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China; State Key Lab of Virtual Reality Technology and Systems, Beihang University, Beijing 100191, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.affiliation: Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China; State Key Lab of Virtual Reality Technology and Systems, Beihang University, Beijing 100191, China; National Research Center for Rehabilitation Technical Aids, Beijing 100176, China. Electronic address: yubofan@buaa.edu.cn.
authors.forename: Yubo
authors.initials: Y
authors.lastname: Fan
mesh_terms: D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D002547:Cerebral Palsy / Q000473:pathology / Q000503:physiopathology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D020342:Finite Element Analysis; D005530:Foot Deformities / Q000473:pathology / Q000503:physiopathology*; D005545:Forefoot, Human / Q000473:pathology / Q000503:physiopathology*; D005684:Gait; D006801:Humans; D008297:Male; D008953:Models, Anatomic; D013628:Talus / Q000473:pathology; D016138:Walking
keywords: Cerebral palsy; Finite element model; Internal bones; Valgus foot