Ectopic insertions of the biceps femoris tendon at the knee can cause impingement with the fibular head, leading to pain with or without snap. There are several variant insertions that have recently been described and classified. Pain syndrome primarily affects athletic patients, often cyclists, disrupting sports practice. Diagnosis is difficult and often late. Medical treatment is often disappointing, leading to surgery. The aim of surgery is to remove the impingement between the ectopic insertion of the biceps tendon and the fibular head, by releasing the unduly anterior tendon, sometimes from the tibia and reinserting it in an anteroposterior tunnel in the fibular head. This reinsertion in a physiological zone without impingement is then fixed by an interference screw.