Severin Classification (DDH Radiographic Outcome)
The Severin classification of the radiographic outcome of the hip after treatment for developmental dysplasia (DDH), by congruency and the center-edge angle at maturity, groups I/II/III/IV/V/VI.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Severin group
- II - concentric, moderate deformity
Result: Severin group II: a concentric hip with moderate deformity of the femoral head, neck, or acetabulum.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Group I
- Normal or nearly normal hip; normal CE angle for age.
- Group II
- Concentric hip with moderate deformity; slightly reduced CE angle.
- Group III
- Dysplastic hip without subluxation; low CE angle.
- Group IV
- Subluxated hip (not concentric).
- Group V
- Femoral head in a secondary (false) acetabulum.
- Group VI
- Redislocation (complete dislocation).
What you enter
- Severin group
How this is calculated
Severin E. Contribution to the knowledge of congenital dislocation of the hip joint: late results of closed reduction and arthrographic studies of recent cases. Acta Chir Scand. 1941;84(Suppl 63):1-142. Search PubMed for this source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.