Protrusio acetabuli

Protrusio acetabuli may be asymptomatic. Limitation of joint range of movement is the earliest sign, along with pain.

Classification

Protrusio acetabuli is divided into two types, primary and secondary.

• Primary protrusio acetabuli are characterized by progressive protrusio in middle aged women, and may be associated with osteoarthritis. They may be familial.
• Secondary protrusio acetabuli's causes include femoral head
  total hip replacement surgery

• Unilateral protrusio acetabuli may be caused by tuberculous arthritis, trauma, or
  fibrous dysplasia
  .
• Bilateral protrusio acetabuli may be caused by rheumatoid arthritis, Paget's disease, osteomalacia,^[2] Marfan syndrome,^[3] and ankylosing spondylitis.

Prognosis

The protrusio may progress until the femoral neck impinges against the pelvis.

Treatment

Arthroscopic surgery (or open joint surgery) is an effective treatment. Joint replacement surgery may be necessary in the case of severe pain or substantial joint restriction.

References