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Abstract
Background: Flatfoot is a common disorder that arises from a decrease of the medial longitudinal arch. Despite the available evidence of the pathological effects of flatfoot in adults, very little was known about how different degrees of flexible flatfoot impact on muscle performance of the lower extremity. Objective: The purpose of this study was to investigate the effect of different grades of flat foot deformity on performance of selected lower limb muscles. Materials and Methods: 44 asymptomatic, flexible flat foot, with1st and 2nd grades participants from both genders with normal BMI(18-25kg/m2,were recruited from faculty of physical therapy,Cairo University. Age ranged from (18-47 years) were assigned into three groups; group I (1st grade flat foot n= 12) and group II ( 2nd grade flat foot n= 14) and ; group III (Control n= 18). The grade of flatfoot deformity was determined by footprint method. Isokinetic dynamometer was used to assess peak torque and total work, as measures of muscle performance, for dorsiflexors, planterflexors, invertors and evertors at 60{u00BA}and120{u00BA}/sec. Results: The study revealed that the mean value of the peak torque of the dorsi flexors was statistically significant lower in group II (2nd grade flatfoot) than in the control (P=.025) and group I (1st grade flat foot, P=.045) for the 60{u00B0}/s velocity. Further, the mean value of the planterflexors total work was significantly (P=.015) lower in group II (2nd grade flatfoot) than in the control group for the 120{u00B0}/s velocity Conclusion: The evidence from this study suggested that the severity of flatfoot deformity has negative impact on the performance of the ankle muscles