PFPS or patellofemoral pain syndrome, can effect both knees, though more commonly it is more painful in one knee. According to the British Journal of Sports Medicine PFPS hinders more young and active people, and twice as many women as men. This is most likely because women tend to have wider hips, resulting in a greater angling of the thighbone to the knee, which puts the knee cap under more stress. The symptoms of PFPS are caused by the irregular tracking of the patella (kneecap) in the femoral groove.
The most common complaint of those suffering with PFPS is tenderness behind and around the knee. Some also experience pain on the posterior side of the knee capsule as well. Instability and cracking could also be signs of PFPS. Although symptoms will be different in each case, running on hills and uneven surfaces often aggravates PFPS symptoms.
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