Dear Shantal, it seems that your post in not new but I hope this will help:
yes a person can get PFPS if he is practicing
repetitive running and the reason is that the repetitive running without warming the muscle by preparing it for actvities by streching can cause a microtrauma to the muscle fibre, tendon and joint and the joint react by hypersecretion of the synovial fluid as normal reaction to protect the joint and after the synovial fluid increased (even a little 10 to 15 ml) this can make the knee unable to extend to the last degree (invisible flexion) causing a rest of the VMO who is responsible of the extension of the knee on these degrees also is responsible of the stabilisation of the patella on it is place, after time the VMO become weak and cause the patello femoral syndrom.
I hope this help you
Juliette Moussa
S. Physiotherapist