Aim of the study is to investigate the effect of adding posterior ilium mobilization on knee pain, knee function, anterior pelvic tilt, dynamic knee valgus, muscle strength of extensors, abductors and external rotators of hip and knee extensors in patients with patellofemoral pain syndrome.

Inclusion Criteria:

1. Age of the subjects between 18-35 years.
2. BMI will be ≤ 29.5
3. Anterior or retro patellar knee pain for at least 6 weeks duration.
4. Foot posture index score from +6 to +12.
5. Anterior pelvic tilt angle more than 8 degree.
6. Pain elicited at least by two of the following four tests; (i) Isometric muscle contraction with slight bent knee,(ii) palpation of the patellofemoral joint line, (iii) patellar compression against the femoral bone (iv) active resisted knee extension.
7. Pain intensity more than 3 at ANPS and provoked by at least two of the following activities: running, walking, hopping, squatting, stair negotiation, kneeling, or prolonged sitting.

Exclusion Criteria:

1. Meniscal or other intraarticular pathologic conditions; cruciate or collateral ligament involvement.
2. A history of traumatic patellar subluxation or dislocation.
3. Previous surgery in the knee, ankle and hip joints.
4. Knee, ankle and hip joints osteoarthritis.
5. Taking non-steroidal anti-inflammatory drugs or corticosteroids within 24 h before the test.
6. History of brain injury or vestibular disorder within the last 6 months.
7. Pregnant female.