The Effect of Different Slopes of Treadmill on the Angular Displacement of the Knee and Hip Joints during Running among Patients with Patellofemoral Pain Syndrome

Milad Fallahzade, Mohamma Dreza Amirsey Faddin, Fariborz Mohammadipour


Due to the effect of lower limb deformities on the people’s gait pattern and the incidence of other damages and injuries, providing new methods and special practices related to the injuries of this area of the body are taken into consideration. One of the most common injuries that a large percentage of the populations are suffering from it is patellofemoral pain syndrome (PFPS). Although the cause of this syndrome is unknown, but abnormal movement of the patella may be the primary reason. Patellofemoral disorders are mostly because of the bonedysfunction and soft tissue injury that provides the ground for biomechanical disorders. The changes in kinetic and kinematics may lead to increase theinflicted loads on the patellofemoral joint that at the end causes the Patellofemoral pain syndrome. The aim of this study is to investigating the knee angular displacement (KAD) and hip angular displacement (HAD) during running on a treadmill at different slopes, in patients with PFPS. In this study, 18 subjects with PFPS (age 47.1 ± 87.23 years old, Height, 62.5 ± 174.22 cm, 10.07 ± 69.18, weight and BMI 3.09 ± 22.79) kg and 19 healthy subjects (age 1.30 ± 24.47 years old, height 6.34 ± 173.78 cm, 9.41 ± 74.33 kg mass and BMI 3.10 ± 24.63) were selected to participate among the other participants in this test, KAD and HAD variables during a full cycle of running on a treadmill on the various slopes from -5, zero and +5% and with a constant speed of 2 meters per second, by using three-dimensional motion analysis system with 6Optoelectronic cameras were measuredand to remove noise resulting from the markers’ movement, Butterworth low-pass filter with a frequency of 8 Hz was used. According to the normality of variables, independent t-test were used to compare the intergroup and for the within groups were used of repeated variance analysis at the significant level of P < 0.05. There was no significant difference between the averages of KAD in patients with PFPS and healthy ones in zero slopes (P=0.11) and +5 per cent (p=0.06) except in a slopes of -5 per cent (P=0.01). There was no significant difference between patients with PFPS and healthy HAD mean slope of -5 per cent (P = 0.83), zero (P = 0.64) and +5 per cent (P = 0.18). There was no significant difference in comparing the average of KAD individuals with PFPS between the slopes of -5 and zero percent (P =025), +5 and zero percent (P =0/01) and -5 and +5 per cent (P =0.95). Similarly, there was no significant difference between HAD individuals with PFPSexcept at -5 and +5 percent slope (P =0.01), slopes between -5 and zero percent (P =0.12) and +5 and zero percent (P =0.01). In general, positive and negative slopes of the treadmill has no effect on KAD and HAD.



Patellofemoral pain syndrome – Sloping surfaces –Angular displacement (AD) - Kinematics – Running

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