Runner's v Jumper's Knee

Runner's Knee or Patellofemoral Pain Syndrome (PFPS) is anterior (front) knee pain and is often confused with chondromalacia (which is a softening or wearing away of the cartilage behind the patella resulting in inflammation and pain).  PFPS can occur either with overuse, repetitive loading activities causing abnormal stress to the knee joint, or through biomechanical abnormalities altering the tracking of the patella and alignment, or muscle dysfunction and tightness.  If you have pain with running, ascending or descending stairs, squatting, or prolonged sitting, or if you have a gradual achy pain that occurs behind or underneath the patella, or knee stiffness for a prolonged period of time, then you might want to look into the possibility of PFPS and treatment.

Jumper's Knee or Infrapatellar Tendinitis is an overuse syndrome characterized by inflammation of the patellar tendon.  Typical in sports such as basketball, volleyball, jumping sports producing significant strain in the tendinous tissues.  Causes can be poor running style, overtraining, sudden changes in training surface, lower-extremity inflexibility, or muscle imbalance.  If you have pain in the distal kneecap into the infrapatellar tendon or pain when running, walking stairs, squatting, prolonged sitting and you do a lot jumping activities, you might want to look at your footwear, training techniques and frequency.