Background: A high percentage of young children present with flatfeet. Flat foot in children and adolescents, as a consequence of various factors such as hypo kinesis, obesity or hereditary factors, represents a current problem.The purpose of this study was to determine relationship between flatfoot and Q Angle in male secondary school students from standing position.Subjects and Methods: Forty participants were included in this study divided into two groups, group A (20 normal healthy male secondary school students) while group B (20 male secondary school students are suffering from flat foot ); (age range 16-18 years, weight 71.5 ± 14.4 kg, height 171.5 ± 6.1 cm, were selected randomly.Results: Results indicated that there was statistically significant increase in participant's quadriceps-angle of the right or left knees (P< 0.05) in group B (male secondary school students are suffering from flat foot) during standing position.Conclusion: There were no statistically significant changes in the participant's quadriceps-angle between the right and left knees (P>0.05) either in group B (male secondary school students suffering from flat foot) or in group A (normal healthy male secondary school students). With regard to this study results, we concluded that, flat foot deformity may resulted in increasing the value of Q angle.

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Background: The aim of this study was to evaluate the changes in postural control and stability among prep school students in Tanta city with and without backpacks. Method: The study was conducted with a sample of 30 children, 16 boys and 14 girls with a mean age (years) 13 + 1.03, body mass (kg) 40.6 + 10.14, height (m) 1, 50 + 0.15, BMI (kg / m²) 20.25 + 3.70. Samples were selected randomly, divided into 2 equal groups. Group (A):15 Participants tested with back packs, group (B): 15 Participants tested without back packs. Balance assessment was done in biomechanics lab, faculty of physical therapy, Delta University for Science & Technology. The dynamic balance parameters (Anterior posterior (AP), Mediolateral (ML) and Overall (OA) stability indices) measured by Biodex Balance System at stability level-7, with standard load (3 kg), based on average back pack mass of the volunteers. Results: the results suggest there was statistical significant difference between both groups (A&B) (P< 0.05). There is decrease in balance parameters including (OA, AP and MLindices) at seven level of stability during the dynamic balance test in group A which tested with back packs compared with group B which tested without backpacks. Conclusions: When comparing between the mean values of participant's stability indices (OA, AP and ML) at stability level-7 within the same group (A or B), there was no statistical significant difference (P> 0.05).

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