Deficiency of acetabular rim and acetabular wall present a difficult problem in total hip arthroplasty. Main causes of acetabular defect are aseptic loosening of the acetabular component, acetabular dysplasia, rheumatoid or other type
of
severe arthritis, large bone cyst or bone tumor, defect after trauma and acetabular defects must be supported to engage the acetabular cup. Many antuors have been managed this problem using the various methods such as bone cement,
autogenous
or
allogenous bone graft and bipolar endoprosthesis with or without acetabular ring, wire mesh. To reconstruct the normal center of rotation of the acetabulum, allograft or autogenous graft with acetabular reinforcement ring and cement
fixation have been done in twelve patients.
Preoperative and postoperative hip joint functions by Harris hip score was increased from average 50.7 to 95.9(Average follow up: 2 years 3 months). In ine case, autoenous bone graft collapse without cup failure was noted. The other
allograft or
autografted bone was healed completely without evidence of collapse.
Reconstruction of acetabular bone defect with acetabular reinforcement ring combined with allograft or autogenous bone graft is useful method especially, in case that large bone defect remains in the acetabular bed in senile or rheumatic
osteoporotic patient with bone defect.
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