Hip Arthroplasty
A 78-year-old woman presents with her third posterior dislocation following revision THA performed 18 months ago for aseptic loosening. She has severe gluteus medius weakness (Trendelenburg gait) and cannot adhere to hip precautions due to early dementia. The acetabular component is well-fixed at 45 degrees inclination with appropriate version. A new liner is being considered. Regarding constrained liners in THA:
Mark each as TRUE or FALSE
Constrained liners provide mechanical capture of the femoral head to prevent dislocation; indication...
Constraint increases stress transfer to the bone-implant interface; this can lead to higher rates of...
Constrained liners reduce stress on the bone-implant interface; they can be used with loose acetabul...
Design options include tripolar (constrained liner with bipolar outer bearing - allows motion at out...
Complications include dislocation despite constraint (occurs through levering or overwhelming force)...
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Click T (True) or F (False) for each option