Developmental dysplasia of the hip

Represents a spectrum of conditions affecting the proximal femur and acetabulum, ranging from acetabular immaturity to hip subluxation and frank hip dislocation.

The Barlow and Ortolani screening tests are recommended up to 6 months of age, although they begin to lose their sensitivity and usefulness around 3 months of age due to increased musculature. Thereafter, limited and/or asymmetric hip abduction suggests the diagnosis.

Ultrasound may be used to confirm an abnormal hip examination, but should be used with caution as a preliminary screening test due to the high number of false positive results.

There is a high rate of spontaneous resolution of hips identified as abnormal by both clinical examination and ultrasound in the neonatal period. Frank dislocations and persistently abnormal examinations should be referred to a paediatric orthopaedist.

Most cases can be treated non-surgically using an abduction harness (Pavlik harness).

Surgery is required for children with severe DDH or those who have failed treatment with an abduction harness, and in older children.

The term developmental dysplasia of the hip (DDH) represents a spectrum of conditions affecting the proximal femur and acetabulum, ranging from acetabular immaturity to hip subluxation and frank hip dislocation. In true DDH, the femoral head has a persistently abnormal anatomical relationship with the pelvic acetabulum, which leads to abnormal bony development that can ultimately result in premature arthritis and significant disability. This is distinct from transient dysplasia, which represents acetabular immaturity in which the anatomical relationship stabilises and normalises over a period of weeks to months.