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Classification of Developmental Dysplasia of the Hip (DDH)

1. By "Type"

  1. Identified in perinatal period & respond well
  2. Secondary to neuromuscular disorder
  3. Teratologic disorders

2. by "Degree"

  1. Hip instability
  2. Hip subluxable
  3. Hip dislocatable
  4. Hip dislocated

3. Radiological

  1. Epiphysis medial to Perkins & below Helgenrieners
  2. Below Helgenrieners but lateral to Perkins
  3. Lateral to Perkins at level of acetabular margin
  4. Lateral to Perkins & above acetabulum

4. Also "Early" or "Late"