Specialty rheumatology ICD-9-CM 718.6 | ICD-10 M24.7 DiseasesDB 33283 | |
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Protrusio acetabuli is an uncommon defect of the acetabulum. The acetabulum is the socket that receives the femoral head to make the hip joint. The hip bone of the pelvic bone/girdle is composed of three bones, the ilium, the ischium and the pubis. In protrusio deformity, there is medial displacement of the femoral head in that the medial aspect of the femoral cortex is medial to the ilioischial line. The socket is too deep and may protrude into the pelvis.
Contents
Classification
Protrusio acetabuli is divided into two types, primary and secondary.
Primary protrusio acetabuli
Secondary protrusio acetabuli
Causes include:
Protrusio acetabuli may also be thought of as unilateral or bilateral.
Unilateraly protrusio acetabuli
Bilateral protrusio acetabuli
(Source Dahnert's Radiology)
In addition, protrusio acetabuli may be present bilaterally in Paget's disease, Marfan syndrome, rheumatoid arthritis, ankylosing spondylitis, and osteomalacia;
Signs and Symptoms
Natural course
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. Prominent trabeculae. * Normal sacro-iliac joints and symphysis pubis.