Isokinetic Profile of Knee Extensor and Flexor Muscles in Patellofemoral Pain Syndrome Patients

Original Research Article Purpose: The aim of the present investigation was to determine the influence of patellofemoral pain syndrome (PFPS) on knee extensors and flexors. Methods: 58 subjects diagnosed with PFPS underwent an isokinetic concentric examination at 60◦/s and at 180◦/s. Data were analyzed through descriptive and correlative statistics with a significance level of 0.05. Results: Patients showed lower extension peak torques compared to body weight and lower muscle peak torques on the involved knee compared to the healthy one, but a normal flexors to extensors ratio. Difference between genders concerned peak torques and total work. Relationships between anthropometric and isokinetic data existed only in females. Pain levels were not correlated to isokinetic measurements. A bigger male sample size and eccentric testing might be necessary to expose other correlations. Conclusion: Our results suggest that strengthening both knee extensors and flexors must be considered in the treatment and prevention of PFPS.