The knee is a complex joint. It includes the articulation between the tibia and femur (leg and thigh) and the patella (knee cap). For many years runner's knee was considered to be chondromalacia of the patella. This essentially means a softening of the cartilage of the knee cap. It has been concluded that the most common knee problems in running relate to what is called the "patellofemoral complex". This consists of the quadriceps, knee cap and patellar tendon. What is now called patellofemoral pain syndrome (PFPS) is also known as runner's knee. Thus, we have included information concerning each of these conditions.
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