The purpose of this study is to determine if a lower back treatment would change the knee pain intensity and the level of functional activities as well as the muscle activities in people with anterior knee pain. The investigators hypothesized that the lower back treatment may change the hip and knee muscle activities as well as reduce the knee pain intensity and improve the functional activities in people with anterior knee pain.

Inclusion Criteria:

• Insidious onset of symptoms of non-traumatic origin.
• Pain with patellar facet palpation or compression.
• anterior or retropatellar knee pain during at least two of the following activities: (a) ascending stairs, (b) descending stairs, (c) kneeling, (d) squatting, (e) hopping, (f) running, (j) jumping, (h) prolonged sitting for more than 20 minutes.

Exclusion Criteria:

• History of spine, hip or knee surgery.
• History of hip pathology or other knee condition.
• Current significant injury of any lower extremity joints.
• Pregnancy.
• Sign of nerve root compression.
• Osteoporosis or history of compression fracture.