411 REFERENCE · Wiktionary
Risser sign
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
The correlation was first described by Risser in 1958, with a graded classification scheme developed at a later time.
Proper noun
An indirect measure of skeletal maturity, whereby the ossification stage of the iliac apophysis is used to judge the ossification of the spinal vertebrae.
en eponyms