Patello-Femoral Syndrome (Knee Pain)
Displacement of the kneecap as it tracks over the femur (patella-femoral syndrome) causes inflammation and pain at the underside of the patella.
The patient complains of a nagging pain beneath or on the sides of the kneecap during activities like walking upstairs or getting out of a car. In addition, a dull ache may occur after sporting activities or getting out of a chair. Also, the patient experiences a crunching or clicking (crepitus) sensation around the kneecap. Sometimes swelling is present.
Excess internal tibial rotation is directly associated with excessive pronation. Therefore, medial displacement of the Patello-femoral path encourages lateral displacement of the patella. The cartilage under the patella will eventually soften, resulting in pain and inflammation under and about the patella, especially with excess loading activities such as running.
The cartilage becomes damaged because the patella is not sliding smoothly over the Patello-femoral path.