CT results: assessment of bone mineral density (BMD) in Hounsfield units (HU) at the sacral promontory (S1) in an area of 566 mm2. Measurement of periprosthetic bone thickness (in mm) at the apex of the acetabular convexity, the calcar, below the calcar, and at the apex of the stem; absolute and percentage differences between baseline (T0) and after 8 months (T2).
| CT Result | Unit | Time 0 | Time 2 | Difference T2 vs T0 |
|---|---|---|---|---|
| S1 BMD | HU | 87.15 | 154.32 | +77.70% |
| Quadrilateral lamina acetabulum distance | mm | 17.90 | 18.60 | +3.91% |
| Thickness of femoral cortex at calcar | mm | 0 | 2 | 2.00 mm |
| Thickness of femoral cortex below calcar | mm | 0 | 3.3 | 3.30 mm |
| Thickness of cortex at tip of prosthesis | mm | 9.10 | 11.10 | +21.97% |