Knee Injuries & Conditions

Patella Tendinosis

Term relating to the patella tendon attachment at both its upper attachment (“kneecap”) and lower attachment on the tibia. Represents an overuse injury of tendon attachment. This can present as an acute pain or as a grumbling background discomfort.4 stages – Stage 1: Pain only after activity. Stage 2: Pain during and after activity. Stage 3: Pain during and after activity and with some difficulty in performing the activity/sport satisfactorily. Stage 4: Complete tendon tear requiring surgery.At proximal (“kneecap”) attachment associated condition “Jumpers Knee” or Sinding- Larsen-Johansson disease. Lower attachment also called Osgood Schlatter’s disease.The cause is degeneration of the tendon with microscopic tears. Often associated larger tears are present. Usually there is no inflammatory component.

Quadriceps Tendinosis

Attachment of the muscles of the thigh to the patella. As above.

Baker’s Cyst

Fluid filled cyst which develops behind the knee.


Many potential fluid filled structures around the knee joint can become inflamed, including, prepatellar (Housemaid’s knee), infrapatellar,

Pes Anserine Bursitis and Iliotibial Band Syndrome

Tendons that run past the knee joint on the inner and outer sides can become irritated and inflamed.

Nerve Entrapments

Several nerves around the knee can become entrapped and produce pain which mimics other conditions. Nerves involved include the common and superficial peroneal nerve, infrapatellar branch of the saphenous nerve.

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