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Background and Objective: There are relations between rate of loading, osteoarthritis and genu varum result in osteoarthritis. This study was done to compare the peak vertical ground reaction forces and the rate of loading during single leg drop landing between men with genu varum deformity and normal knee from three heights. Methods: This quasi-experimental studywas carried out on 20 male students with genu varum deformity and 20 male students with normal knee. Genu varum deformity was measured and recorded by collis and goniometer. Subjects performed single-leg landing dropping from three heights (20, 40, 60 Centimeter) on a force platform. Results: The peak vertical ground reaction force in calcaneus contact and the rate of loading between groups significantly were different (P<0.05). No significant difference was found in the peak vertical ground reaction during toe contact. Conclusion: Frontal knee angle affect on loading rate. Maybe one of the reasons for higher injury risk and knee arthritis in genu varum population might be due to higher ground reaction forces and the rate of high loading.

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Background and Objective: Skeleton abnormalities have adverse effect on skeleton structure and natural shape of hight. This study was done to compare the postural position and body mass index in elementary male students in public and private elementary schools. Methods: This descriptive - analytic study was done on 1254 boys (627 subjects of elementary public school and private elementary schools Abhar city in North West of Iran. Weight and height and body mass index of students were measured. Stature abnormalities measured with Bob, Kayfometer, Goniometer, Caliper and Padscope. Results: BMI of students was more in private school (18.23±3.76) in compare to public schools (17.4±3.46) (P<0.05). Scoliosis, kyphosis, flat back, lordosis, flat foot and pescavus abnormalities was more in students of public schools in comparision with private school (P<0.05). Conclusion: Physical inactivity and lack of adequate exercise space in private schools cause over weight and stature abnormalities.