Causes of Protrusio Acetabuli
- Rheumatoid arthritis & JCA
- Osteoporosis
- Osteomalacia & Rickets
- Pagets Disease
- Ankylosing Spondylitis
- Osteoarthritis (occasionally)
- Acetabular fractures
- Familial / idiopathic
- Marfans syndrome (45% have protrusio, 50% of these are unilateral & 90% associated with scoliosis)
- Osteogenesis Imperfecta
