"type IIIa: no echos in cartilaginous roof"
"type IIIb: echos in cartilaginous roof due to structural alteration and damage"
"The descriptions used in the Graf method assume the standard projection is an ultrasound image of the hip that is set up as a vertical right hip AP view."
"perichondrium goes upward (ultrasound image set as right hip AP)"
"perichondrium goes horizontal (ultrasound image set as right hip AP)"
"beta angle"