The effect of 8 weeks selective closed kinetic chain exercises on pain and balance of women with patellafemoral pain syndrome
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Abstract
Introduction: Patellefemoral pain syndrome is one of the most common injuries due to excessive use of the knee especially in women. People with this trauma suffer from pain in the anterior knee area and changes in lower limb function, including balance. In the closed kinetic chain, the pressure applied to the bone area of patella with femor is reduced and the amount of reaction force of patellfemoral joint decreases and the stress in the patellafemoral joint is minimized. Therefore, the purpose of this study was to investigate the selected closed kinetic chain exercises on pain and balance of middle-aged women with patellafemoral pain syndrome.
Methodology: In this study, 20 women with patellafemoral pain syndrome were selected in a purposeful and accessible way. The samples were randomly divided into two exercise group(age 47.46 ± 3.18, height 163.24 ± 7.23, 69.18 ± 6.46 kg) and control group (age: 2.29 ± 45.18 years, height: 6.83 ± 163.58 cm, weight: 67.93 ± 5.96 ± 5.6 kg). The instrument for this study was visual analogue scale (VAS) for assessing pain severity and Y balance test for balance assessment. The protocol of selective closed kinetic chain exercise performed for 8 weeks, 3 sessions per week and 60 minutes each session on the training group. To analyze the data, descriptive statistics, independent t-test and paired t-test were used at the significant level (P <0.05).
Results: Independent t-test showed a significant improvement in balance and pain relief in the experimental group compared to the control group after 8 weeks selective closed kinetic chain exercises (P <0.05). Also, the results of in-group comparison of paired t-test showed a significant improvement in balance and pain relief in the experimental group after 8 weeks selective closed kinetic chain exercises (P <0.05).
Discussion: According to the findings of the research, it can be concluded that the selective closed kinetic chain exercises, with strengthening the abdutor and rotator muscles of the femor and activating the quadriceps muscles, improve the patella tracking and reduce the contact forces in the patellafemoral joint And thus reduce pain. These exercises also improve the balance by activation of the VMO muscle which leads to knee joint stability during performance of the Y balance test and thus increasing the balance. Therefore, closed kinetic chain exercises can be part of the therapeutic protocol of the patellafemoral pain syndrome.
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