Bearing Surface Complications
A 58-year-old man presents with progressive groin pain and new thigh pain 5 years after modular metal-on-polyethylene total hip arthroplasty. He has a large-diameter femoral head (40mm) on a titanium stem. Serum cobalt and chromium levels are elevated. Radiographs show a well-fixed stem and cup with no obvious loosening. MRI with metal artifact reduction shows a large pseudotumor around the hip. Regarding trunnionosis in total hip arthroplasty:
Mark each as TRUE or FALSE
Trunnionosis refers to adverse local tissue reactions from corrosion and fretting at the modular hea...
Clinical presentation includes pain (groin or thigh), swelling, and reduced range of motion; elevate...
Trunnionosis only occurs with metal-on-metal bearings; small femoral heads have higher risk; titaniu...
Pathophysiology involves fretting (micromotion) at the taper interface generating debris, which init...
Treatment depends on severity: close monitoring with serial imaging and metal ions for asymptomatic ...
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Click T (True) or F (False) for each option