Femoroacetabular impingement, due to differences in the morphological matching of the femoral head and acetabulum, results in injury to the hip joint during motion. This injury is often progressive and cumulative. Although the lesions are primarily due to developmental factors, symptoms do not appear in childhood. Instead, once symptoms appear, they are often progressively worse and difficult to heal or recurrent, primarily due to significant damage from prolonged impingement. Impingement can occur in both the neck of the femur and the acetabular rim, with those occurring at the neck of the femur being called CAM (cam-type) impingement and those occurring at the acetabular rim being called PINCER (pinch-type) impingement. The following case is a clear case of “cam-type” impingement, and the symptoms completely disappeared after total arthroscopic removal of the femoral head neck. Pre-operative hip orthopantomogram shows a large lateral femoral head neck osteochondrosis arthroscopically.