total hip arthroplasty, hip dislocation, hip replacement
Nontraumatic anterior hip dislocation fully ex- posed lesser trochanter in external rotation. Femoral stem and cup shell were still well fixed without any sign of osteolysis.
After close reduction head was well seated into metal liner, both leg lengths were equal. Soft tissue tension was proper after telescoping test.
From a careful analysis on the post reduction x-ray, elevated metal liner was seen at the inferior junction of metal- polyethylene liner interface.
Shows a small amount of necrotic tissue around the impingement area. Very little metallosis is detected.
Spotorno metal shell cup and liner.
Extracted Metasul liner shows inferior polyethylene surface with laminated wear. The change of metal liner position means polyethylene and metal liner disintegrated; however, they are well fixed together. The metal liner at anterosuperior is sunk. In the opposite direction, the posteroinferior border of metal liner is elevated.
The back of the liner does not show wear out of locking mechanism. A small piece on the right of the liner comes from the extraction procedure.
Report of the number and causes of acetabular component revision
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