الفهرس 
Prevalence of 2jumper{u2019}s knee3 in different ages of volleyball players : Survey study
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Abstract
Background: Jumper’s knee also called patellar tendinopathy, is a painful condition of the knee caused by small tears in the patellar tendon that mainly occurs in sports requiring strenuous jumping. Purpose: This study was conducted to investigate and compare the prevalence of jumper{u2019}s knee among different ages of volleyball players in Cairo, Egypt. Methods: Cross sectional survey study was conducted on 861 volleyball players from 18 clubs in Cairo. All participants signed a consent form prior to participation in the study.The participants were the tallest players in the court and do repeated vertical jumps.They were assigned into two groups based on their gender and then each group was divided into 5 groups according to their age. Weight, height and VISA score was recorded for each participant, Results: it showed that in male volleyball players, the mean value of age was 18.96 ±4.58 year and mean value of BMI was 22.32 ±1.98 kg/m2. while In female volleyball players, the mean value of age was 17.21 ±3.73 year, and mean value of BMI was 21.68±1.89kg/m2 The statistical analysis by Chi-square test revealed that there were significant differences in incidence of jumper{u2019}s knee among groups of male volleyball players (P=0.0001; P<0.05) and female volleyball players (P=0.0001; P<0.05). Conclusion: There were statistically significant differences in the prevalence of jumper{u2019}s knee among different ages of volleyball players in Cairo, Egypt