الفهرس 
Assessment of dynamic balance in jumper’s knee athletes
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Abstract
Background: For competitive athletes and sports medicine clinicians, patellar tendinopathy is one of the most common and difficult problems to deal with. It is frequently the source of persistent pain and inhibits sports practice and performance. It is clinically diagnosed as activity-related anterior knee discomfort with focal patellar tendon tenderness. Jumper’s knee (patellar tendinopathy) is common in activities that place a high demand on leg extensor speed and power, such as volleyball, basketball, football, and athletics, with prevalence rates ranging from 40% to 50%. Balance is dependent on the hip, knee, and ankle working together to provide integrated feedback and movement strategies. Decreased afferent feedback or inadequacies in the strength and mechanical stability of any joint or structure throughout the lower extremity kinetic chain can disrupt balance. Athletes with poor balance have been linked to an increased risk of injury. Aim of the study: The purpose of the study was assess the dynamic balance in athletes with jumper’s knee. Subjects and Methods Fifteen basketball players with unilateral patellar tendinopathy were included in this study with age ranged from 15-30 years and body mass index ranged from 18.5-30 kg/cm2. The assessment was conducted for each subject individually on the Balance System (Biodex Medical Systems Inc, Shirley, NY, USA), to compare stability parameters between affected and non-affected lower limbs. The stability parameters examined in this current study were overall stability index, anteroposterior stability index and mediolateral stability index. Results: Statistical analysis using T-test was made to compare between the mean values of stability indexes There was no significant difference between the mean value of overall stability index (t =- 0.09, p =0.46), anteroposterior stability index (t = 0.07, p =0.47)and mediolateral stability index (t = - 0.17, p =0.43) in affected limb compared with non-affected at stability level 4 Conclusion: it is concluded that jumper’s knee doesn{u2019}t affect lower limb dynamic stability to significant level