Developmental dysplasia of the hip (DDH) - Crowe classification of severity of adult DDH
Crowe et al. classified adult developmental dysplasia of the hip (DDH) into four grades according to the extent of underlying subluxation on AP x-ray of the pelvis.
| Crowe grade | Dislocation | Description |
|---|---|---|
| Grade 1 | <50% subluxation | femur and acetabulum show minimal abnormal development |
| Grade 2 | 50 - 70% subluxation | the acetabulum shows abnormal development, femoral head articulates with false acetabulum, which partially covers the true acetabulum |
| Grade 3 | 70 - 100% subluxation | the acetabulum is developed without a roof |
| Grade 4 | >100% subluxation (luxation) | the acetabulum is deficient but remains recognizable |
References:
1. Crowe JF, Mani VJ, Ranawat CS. Total hip replacement in congenital dislocation and dysplasia of the hip. J Bone Joint Surg Am. 1979 Jan;61(1):15–23.
Updated 15/8/2013 09:44 by Lambert