Biologic response to wear particles (polyethylene > metal/cement) drives periprosthetic osteolysis via macrophage cytokine cascade. Risk factors: conventional PE, thin liners, malalignment, edge-loading, high activity, third-body wear. Radiology: progressive radiolucent lines, endosteal scalloping, cystic defects; CT helpful for pelvic osteolysis; metal artifact reduction MRI. Prevention: highly crosslinked PE (HXLPE), ceramic heads, proper component position, larger heads with caution for trunnionosis. Management: rule out PJI; debride granuloma, graft defects, exchange bearings or revise components depending on fixation and bone loss.
What is the primary biological mechanism driving periprosthetic osteolysis in arthroplasty?
Which particle size is most biologically active in driving osteolysis?
Which of the following is NOT a risk factor for osteolysis in arthroplasty?
In which radiographic zone would you expect to see signs of impending loosening of the acetabular component?
What is the role of RANKL in periprosthetic osteolysis?
Which imaging modality is particularly useful for assessing pelvic osteolysis?
What is the recommended management step if periprosthetic osteolysis is suspected?
Which material is associated with the least biologic activity and therefore less risk of osteolysis?
What is the purpose of using larger heads in hip arthroplasty?
What is the role of osteoprotegerin (OPG) in the context of osteolysis?
