Fig 2.

Dunn view of right hip with magnification. (A) Under fluoroscopic guidance, the proximal extent and distal extent of the cam lesion are demarcated with the electrocautery. (B) A burr is used to remove bone from distal to proximal, removing more bone distally than proximally to restore the natural concave shape of the femoral neck and the convex shape of the head-neck junction. (C) Arthroscopic image of the cam lesion after fibrocartilage is removed. (D) After cam resection, the convex curve of the head-neck junction and the concave shape of the femoral neck are obtained.