Asymptomatic Periprosthetic Joint Infection of the Hip with High-Virulence Pathogens: Report of Two Cases

Figure 2

Anteroposterior and axial radiographs of the right hip of Case Two, 6 years after revision THA (a) Despite a newly diagnosed S. lugdunensis PJI, components show no signs of loosening. At the 10 years mark (b) after 4 years of documented, untreated PJI, the radiolucent line observable frequently in Gruen zone 1 with this type of stem (black arrows) remains stable. There is also some evidence of diaphyseal, endocortical osteolysis (white arrows), but no subsidence of the stem, and endosteal ossification at the tip of the stem remains stable. The cup is well fixed. In an asymptomatic patient, this implant can be considered sufficiently integrated. Note the poor contrast, particularly on the axial views in the lower row, due to morbid obesity (BMI of 48 kg/m²).