Effect of six-week static quadriceps stretching on pain and lower extremity kinematics during running in individuals with patellaofemoral pain syndrome

Mohammad Farzaneh, Mansour Sahebozamani, Abdol Hamid Daneshjoo, Mohammad Sadeghi


Patellofemoral Pain Syndrome (PFPS) is one of the most common influential disorders on individual's lower limb. A change in kinetics and kinematics of lower limb, structural disorders of lower limb, paresis, the decrease of strength and dynamic malalignment are the risk factors of PFPS. The risk factors playing a role in PFPS development are as follow: kinematic and kinetic changes during functional activities and the decrease of strength and flexibility of knee and thigh joints.  Therefore, the goal of the current research is to investigate the influence of 6-week static stretching of quadriceps on pain and kinematics of lower limb during running in individuals with Patellofemoral Pain Syndrome. For this aim, 27 individuals with PFPS in two experimental (age 22/86±2/31, year and BMI 24/89±2/25) and control groups (age 23/38±1/44, year and BMI 23/42±2/94) and also 11 healthy individuals (age 24/27±1/73, year and BMI 24/69±1/74) have been chosen from the volunteers for participating in this test. The amount of pain was measured by VAS scale and the kinematic variables of lower limb with the constant speed of 3/3 m/s during running on treadmill were measured by three-dimensional motion analysis system with six optoelectronics camera. Due to normality of kinematic variables, independent t-test was used for comparison between groups and the repeated analysis of variance test with the significance level of P<0/05 was used for comparison within groups. Due to disapproval of parametric test assumptions, non-parametric tests were used for evaluation of pain. After the period of training, there was no significant difference between kinematic variables of lower limb (hip internal rotation P=0/468, valgus knee P=0/255, knee flexion P=0/717, tibial rotation P=0/208 and foot pronation P=0/199). But the amount of pain was significantly different in comparison between groups (P=0/000). Pain was significantly decreased in experimental group (P=0/001) and was significantly increased in control (P=0/031) and healthy (P=0/018) groups. Generally, the implementation of 6-week stretching of quadriceps did not influence on the kinematics of lower limb but it influenced on the improvement of pain. 


Patellofemoral pain syndrome, anterior knee pain, kinematic, running.

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