I really find NASM resources very helpful.
According to the National Academy of Sports Medicine’s, corrective exercise training manual, the following contribute to knee pain. (Chapter 13 – Corrective Strategies for Knee Impairment).
1. Knee valgus and varus
2. An increased Q-angle
3. Poor quadriceps and hamstring complex flexibility
4. Poor eccentric deceleration capabilities
5. Overtraining and playing on hard surfaces
6. Abnormal or dynamic lower-extremity malalignment
7. Altered muscle activation of surround knee musculature, decreased strength of the hip musculature
9. Abnormal gait or running mechanics
10. Weakness in the hip abductor muscles (gluteus medius)