THR: aggresive granumomatous disease

Also known as cement disease, particle disease, aggresive osteolysis
Extensive bone resorption due to hypersentitivity and gaint cell reaction

Well defined lytic lesions, which do not follw the shape of the prosthesis
Common at the tip or medial border of the femoral component
Also seen in acetabulum

Resnick et al, Bone and joint imaging, 3rd edition, Elsevier Saunders publications