A
The acetabular rim
B
The posterior wall of the acetabulum
C
The medial aspect of the femoral neck
D
The anterolateral femoral head-neck junction
Explanation:Correct Option: D. Cam-type FAI is caused by an aspherical femoral head or decreased offset at the femoral head-neck junction. Arthroscopic osteochondroplasty targets this prominent 'bump', which is most commonly located at the anterolateral aspect of the femoral head-neck junction, to restore clearance during hip flexion and internal rotation. (Ref: Ganz et al., Clin Orthop Relat Res, 2003)