Table 1.

Morrey grading system of periprosthetic osteolysis and radiographic loosening [15]

Type
0	Radiolucent line less than 1 mm thick and involving less than 50% of the interface
I	Radiolucent line at least 1 mm thick and involving less than 50% of the interface
II	Radiolucent line more than 1 mm thick and involving more than 50% of the interface
III	Radiolucent line more than 2 mm thick and around the entire interface
IV	Gross loosening