Patellofemoral pain syndrome can also be caused by abnormal tracking of the kneecap on thigh bone. In this condition, the patella is pushed out to one side of the groove when the knee is bent. This abnormality may cause increased pressure between the back of the patella and the trochlea, irritating soft tissues.

Other factors that may contribute

• Use of improper sports training techniques or equipment
• Changes in footwear or playing surface (e.g., switching from a natural grass field to a field with artificial turf)