Implant Biomechanics
A 65-year-old man presents for routine follow-up 5 years after uncemented total hip arthroplasty. He is asymptomatic with excellent function. Radiographs show excellent stem fixation but notable thinning of the cortical bone in the proximal femur (Gruen zones 1 and 7), particularly in the calcar region. The distal femur around the stem appears maintained. Regarding stress shielding in arthroplasty:
Mark each as TRUE or FALSE
Stress shielding is adaptive bone remodeling in response to altered mechanical loading after joint r...
Factors affecting stress shielding include implant stiffness (higher elastic modulus relative to bon...
Stress shielding only occurs with cemented stems; lower implant stiffness causes more shielding; sma...
In total hip arthroplasty, stress shielding manifests as bone loss in Gruen zones 1 (greater trochan...
Clinical significance of stress shielding remains debated; while radiographic bone loss is common, i...
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Click T (True) or F (False) for each option