A 1950 Swedish case series of 115 children with congenital hip dislocation, all treated by closed reduction between 1937 and 1940. All patients underwent arthrographic monitoring; 72 hips had clinical and radiographic follow-up of 5 years or more. The study asks whether closed reduction achieves durable joint development and whether arthrographic soft-tissue interposition predicts failure.
When Severin published in 1950, Leveuf — the most prominent European advocate of open reduction. Argued that true complete congenital dislocation could never be properly treated by closed means. This paper challenged that directly, providing arthrographic and 5-year radiographic evidence that closed reduction succeeded in two-thirds of cases.
The practical rule from this paper: soft-tissue interposition visible on the post-reduction arthrogram is NOT an automatic indication for open reduction. The barrier resolves with time as long as the head is held reduced. Reserve open reduction for the rare case where closed reduction fails entirely.
Severin's 6-group radiographic classification (Groups I–VI) became the dominant framework for reporting DDH treatment results and remains the most widely used radiographic outcome measure in DDH clinical series and research.
Know the reliability caveat: Ward et al. (1997) and Ali et al. (2001) later showed unacceptably low inter- and intraobserver agreement with this classification. A reminder that descriptive frameworks adopted as field standards are not always psychometrically validated.
A 1950 Swedish case series of 115 children with congenital hip dislocation, all treated by closed reduction between 1937 and 1940. All patients underwent arthrographic monitoring; 72 hips had clinical and radiographic follow-up of 5 years or more. The study asks whether closed reduction achieves durable joint development and whether arthrographic soft-tissue interposition predicts failure.
When Severin published in 1950, Leveuf — the most prominent European advocate of open reduction. Argued that true complete congenital dislocation could never be properly treated by closed means. This paper challenged that directly, providing arthrographic and 5-year radiographic evidence that closed reduction succeeded in two-thirds of cases.
The practical rule from this paper: soft-tissue interposition visible on the post-reduction arthrogram is NOT an automatic indication for open reduction. The barrier resolves with time as long as the head is held reduced. Reserve open reduction for the rare case where closed reduction fails entirely.
Severin's 6-group radiographic classification (Groups I–VI) became the dominant framework for reporting DDH treatment results and remains the most widely used radiographic outcome measure in DDH clinical series and research.
Know the reliability caveat: Ward et al. (1997) and Ali et al. (2001) later showed unacceptably low inter- and intraobserver agreement with this classification. A reminder that descriptive frameworks adopted as field standards are not always psychometrically validated.