Cam morphology on these time points was defined as: (A) visual scores of the anterior head-neck junction, classified as: (1) normal, (2) flattening, and (3) prominence; and (B) alpha angle ≥60°.

Alpha angle, epiphyseal extension and epiphyseal tilt were measured on radial images. Results Alpha angle and epiphyseal extension increased most rapidly between ages 12 and 14 years. Soft-tissue ...