| protrusio acetabuli | A disease characterised by an inward bulging of the acetabulum into the pelvic cavity, resulting from arthritis of the hip joints, usually due to rheumatoid arthritis. Synonym: arthrokatadysis, Otto pelvis, protrusio acetabuli. (05 Mar 2000) |
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| protrusion | The state of being trust forward or laterally, as in masticatory movements of the mandible. Origin: L. Protrudere = to push forward (18 Nov 1997) |