The iliotibial band (ITB) friction syndrome is a common overuse injury that results in pain in the lateral knee. The iliotibial band is a thickened strip of fascia lata that inserts into Gerdy's tubercle on the lateral tibial condyle. When the knee is in full extension it is anterior to the lateral femoral condyle, while in flexion it moves posterior to the condyle. This back and forth migration over the condyle can result in friction and inflammation of the band.

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