| Bone: Pelvis | |
|---|---|
| Female type pelvis | |
| Male type pelvis | |
| Gray's | subject #57 236 |
The Risser sign refers to the amount of calcification of the human pelvis as a measure of maturity.
On a scale of 5, it gives a measure of progression of ossification; the grade of 5 means that skeletal maturity is reached. Risser sign is based on the observation of an X-ray image. Grade 1 is given when the ilium (bone) is calcified at a level of 25%; it corresponds to prepuberty or early puberty. Grade 2 is given when the ilium (bone) is calcified at a level of 50%; it corresponds to the stage before or during growth spurt. Grade 3 is given when the ilium (bone) is calcified at a level of 75%; it corresponds to the slowing of growth. Grade 4 is given when the ilium (bone) is calcified at a level of 100%; it corresponds to an almost cessation of growth. Grade 5 is given when the ilium (bone) is calcified at a level of 100% and the iliac apophysis is fused to iliac crest; it corresponds to the end of growth.
Greulich WW, Pyle SI: Radiographic Atlas of Skeletal Development of the Hand and Wrist, 2nd edition. Stanford, . CA: Stanford University Press, 1959.