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However, patients with similar RCSP showed diverse outcomes when accepting similar treatment, as the corrective resistance of subtalar joint (STJ) could be quite different. This study aimed to investigate the relationship between STJ stiffness and RCSP in different loading conditions. 38 valgus feet of 19 CP subjects were included in the study. A reposition force was applied beneath the STJ and pushed the foot from pronated position to neutral position. The STJ stiffness was calculated as the slope of the line fitting the force-displacement data. Correlations between the STJ stiffness, RCSP, and composite spasticity index (CSI) were analyzed. The spearman correlation coefficient indicated that STJ stiffness had no correlation with RCSPs, yet it had negative correlation with the change of RCSP under difference loading conditions (<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M1\"><mml:mi>\u0394<\/mml:mi><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">R<\/mml:mi><mml:mi mathvariant=\"normal\">C<\/mml:mi><mml:mi mathvariant=\"normal\">S<\/mml:mi><mml:mi mathvariant=\"normal\">P<\/mml:mi><\/mml:mrow><mml:mrow><mml:mtext>1w<\/mml:mtext><mml:mo>-<\/mml:mo><mml:mtext>0w<\/mml:mtext><\/mml:mrow><\/mml:msub><\/mml:math>and<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M2\"><mml:mi>\u0394<\/mml:mi><mml:msub><mml:mrow><mml:mi mathvariant=\"normal\">R<\/mml:mi><mml:mi mathvariant=\"normal\">C<\/mml:mi><mml:mi mathvariant=\"normal\">S<\/mml:mi><mml:mi mathvariant=\"normal\">P<\/mml:mi><\/mml:mrow><mml:mrow><mml:mtext>0.5w<\/mml:mtext><mml:mo>-<\/mml:mo><mml:mtext>0w<\/mml:mtext><\/mml:mrow><\/mml:msub><\/mml:math>). STJ stiffness was also correlated with the composite spasticity index (CSI), implying that this index had an advantage in reflecting the mechanism of valgus deformity and should be considered as a necessary measurement of foot valgus in CP children. The present method for quantification of STJ stiffness could improve the accuracy in the diagnosis and classification of foot deformity and may help increase the understanding of the biomechanical factors in foot deformity rehabilitation.<\/jats:p>","DOI":"10.1155\/2018\/6576108","type":"journal-article","created":{"date-parts":[[2018,4,30]],"date-time":"2018-04-30T23:31:55Z","timestamp":1525131115000},"page":"1-10","source":"Crossref","is-referenced-by-count":1,"title":["Relationship between Subtalar Joint Stiffness and Relaxed Calcaneal Stance Position in Cerebral Palsy Children with Valgus Deformities"],"prefix":"10.1155","volume":"2018","author":[{"given":"Wei","family":"Chen","sequence":"first","affiliation":[{"name":"Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beijing Advanced Innovation Centre for Biomedical Engineering, Beihang University, Beijing, 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