Scheuermann kyphosis can generally be defined as a rigid thoracic deformity above 40° and endplate abnormalities at the apex of the kyphosis in adolescents and young adults.
Although there are no generally accepted diagnostic criteria, the three most commonly used are Sorensen's, Bradford's and Schlenzka and Arlet's criteria.
Sorensen's criteria
Bradford's criteria:
Schlenzka and Arlet criteria:
The main differential diagnosis which should be considered are: