Time Difference Between Onsets of Lateral And Medial Hamstring Muscles During Gait in Patients With Patellofemoral Pain.

Kujala patellofemoral pain scale was used to evaluate knee functions of the PFP subjects.

The surface EMG electrodes (silver/silver chloride, pre-gelled, Ambu Blue Sensor, Denmark) (Konrad P.) with an interelectrode distance of 20 mm between centers were used to record an EMG signal during walking. Portable 8 channel (TELEEMG, BTS, Milan, Italy) with built in x10 amplifications, 10-450 Hz bandpass and sampling rate of 1000 Hz were used for recording. The location and orientation of the electrodes for each MH (ST) and LH (BF) were identified according to SENIAM (Surface ElectromyoGraphy for the Non-Invasive Assessment of Muscles) criteria.

Q angle measurement was applied to both patellofemoral pain and control group subjects in standing position.