1. Prevalence of cam hip shape morphology: a systematic review
E. Dickenson, P.D.H. Wall, B. Robinson, M. Fernandez, H. Parsons, R. Buchbinder, D.R. Griffin 
Osteoarthritis and Cartilage 
Volume 24, Issue 6, Pages (June 2016)
DOI: /j.joca
Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

2. Fig. 1
Diagrammatic representation of hip viewed in the transverse plane. 1 shows a hip with normal morphology. The shaded area in two represents a cam abnormality; as the hip internally rotates this will impinge on the anterior acetabulum.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

3. Fig. 2
Diagrammatic representation of how to measure an alpha angle in a hip with a cam deformity. Line 1 is drawn between the centre of the femoral head and the anterior point where the bony contour exceeds the radius of the head. Line 2 is drawn along the axis of the femoral neck, between the narrowest point of the neck and the centre of the femoral head. The alpha angle is measured between line 1 and 2.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions

4. Fig. 3 PRISMA flow diagram.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2016 Osteoarthritis Research Society International Terms and Conditions