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Roentgenographic evaluation of a conical threaded acetabular cup
E M Keating1, R A Czarkowski, M A Ritter
1Louisiana State University, Shreveport.
Seminars in Arthroplasty
|June 8, 1990
Summary
Radiographic analysis of hip arthroplasties revealed concerning trends in acetabular component performance. Over time, bone fill decreased and radiolucency increased, leading to component migration and revision in some cases.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Radiology
Background:
- Primary hip arthroplasty aims to restore function and reduce pain.
- Acetabular component fixation is crucial for long-term implant survival.
- Early radiographic evaluation can predict implant performance.
Purpose of the Study:
- To radiographically assess the long-term performance of a specific hip arthroplasty design.
- To evaluate bone fill, radiolucency, and migration of acetabular components.
- To determine the failure rate of the acetabular component in primary hip arthroplasty.
Main Methods:
- Radiographic analysis of 83 primary hip arthroplasties in 70 patients.
- Utilized a truncated acetabular cup and cemented titanium femoral stem.
- Applied the DeLee and Charnley method for acetabular zone analysis (zones 1, 2, 3).
- Measured bone fill in zones 1 and 3, and radiolucency in zone 2.
Main Results:
- A significant percentage of acetabulae showed decreased bone fill in zone 3 and increased radiolucency in zone 2 over time.
- By the third postoperative year, 16% (11 of 70) of acetabular components had migrated.
- Despite good clinical scores (Charnley hip score ≥ 5), 11 hips migrated and 3 required revision.
Conclusions:
- The studied acetabular component demonstrated an unacceptable failure rate.
- Progressive radiolucency and decreased bone fill are indicators of acetabular component loosening.
- Further investigation into acetabular component design and fixation is warranted.