A Clinical Study On The Effect Of Blood Flow Restriction Training On The Treatment Of Patellofemoral Pain Syndrome

Objective: patellofemoral pain syndrome is one of the most common diseases of knee joint.The main symptoms are pain in the front of the knee which lasts for several years,and it will not get better because of rest.In serious cases,it will affect the movement ability and even the quality of life of the patients.At present,exercise intervention is the most important and commonly used method in the treatment of patellofemoral pain syndrome.Blood flow restriction training is a method that can achieve the effect of large weight training by pressurizing the limbs and training with small weight.In this study,we compared the therapeutic effect of blood flow restriction training and resistance training on patellofemoral pain syndrome.We used the visual simulation score of sedentary,ascending stairs,descending stairs and squatting,Lysholm knee joint score scale,Q angle and other indicators to evaluate the clinical therapeutic effect,so as to provide the basis for the application of blood flow restriction training in the treatment of patellofemoral pain syndrome.Methods: a single center,randomized controlled trial was used in this study.According to the inclusion and exclusion criteria,26 patients with patellofemoral pain syndrome were selected.The 26 eligible patients were randomly divided into two groups: experimental group and control group.The experimental group received blood flow restriction resistance training,while the control group received routine resistance training,with 13 cases in each group.All 26 patients completed the experiment,no adverse events and dropouts,there was no significant difference between the two groups before intervention(P > 0.05).The training process of the two groups was the same as the training times.The training process included warm-up,muscle strength training of quadriceps femoris and hip muscles,and static stretching of quadriceps femoris.The training was completed twice a week for six weeks.In the muscle strength training of quadriceps femoris,30% of 1RM was used in the experimental group and 70% of 1RM in the control group.The patients in the two groups received four tests,i.e.visual simulation score of knee joint,Lysholm knee joint score scale and Q-angle evaluation in the state of sedentary,ascending stairs,descending stairs and squatting after 0,2,4 and 6 weeks of intervention.Results:(1)in all the visual simulation scoring items of knee joint,the mean score decreased with the time of intervention,which showed that the time difference was statistically significant(P < 0.05)in the VAS scores of sedentary,ascending stairs,descending stairs and squatting state,while the difference between groups and theinteraction between groups and time had no significant difference(P > 0.05).(2)In Lysholm knee joint score,after intervention,the scores of the two groups were gradually higher than before intervention,and the Lysholm scores of the two groups were higher than before intervention after 2,4 and 6 weeks,which showed that: the time difference was statistically significant(P < 0.05),and there was no significant difference between the groups and the interaction between groups and time(P > 0.05).(3)In Q-angle evaluation,with the intervention,the Q-angle degrees of the two groups decreased gradually,which showed that: the time difference was statistically significant(P < 0.05),but there was no significant difference between the groups and the interaction between groups and time(P > 0.05).Conclusion:(1)blood flow restriction training can improve the pain symptoms of patients with patellofemoral pain syndrome as well as routine resistance training.(2)Blood flow restriction training can improve Lysholm score and Q angle of patients similarly with routine resistance training.(3)According to the above conclusion,it is suggested that blood flow restriction training can be used as an alternative exercise program for patients with patellofemoral pain syndrome.