Figure 7d:

Insufficiency fracture of the femoral head. (a, b) Increasing joint space narrowing (arrow) is demonstrated on right hip radiographs over a period of 12 months in a 78-year-old man with increasing clinical symptoms. (c) Axial fluid-sensitive intermediate-weighted fast spin echo image obtained at 12 months shows fracture lines at the posterior aspect of the femoral head (arrow) and a substantial amount of bone marrow edema pattern. (d) Sagittal T1-weighted fast spin echo image of the lumbar spine depicts multiple endplate fractures (arrows) indicating increased fragility of the spine.