Inclusion criteria:
Report the pain on the anterior knee or around the patella, during at least 3 activities: up or down stairs, squatting, running, kneeling, jumping, or hopping and sitting long
Non-athletic woman have unilateral syndrome with positive patellar glide test
There are symptoms for at least 4 weeks
Full knee range of motion without any history of injury
Active trigger point in gluteus medius in opposite side of the affected knee
Age of 17 to 40 years
Exclusion criteria:
Meniscal and intra articular injury
collateral and cruciate ligament injury
tenderness in patellar tendon, iliotibial band and pesansernous tendon
patella dislocation
knee inflammation
the history of knee surgery
pregnancy, malignancy, knee arthritis and neurologic impairment
neurologic symptom in sensory, motor and reflex
knee pain with ankle and foot or hip or lumbar or sacroiliac sources
The presence of trigger point of the gluteus medius muscle on both sides