Dual-energy X-ray absorptiometry (DXA)
Within three days after surgery, DXA scans of the knee were used to examine the peri-prosthetic BMD of the femoral bone. These scans were used as reference for the evaluation of changes in the follow-up scans at 3 and 6 months, and 1, 2 and 5 years. The BMD was measured in two regions of interest (ROIs) on lateral (LA) scans and two ROIs on the anterior–posterior (AP) scans (Fig. Dual-energy X-ray absorptiometry regions of interest for the evaluation of bone mineral density. The blue area marks the implant and is removed from the BMD measurement. The yellow line marks the bone border for BMD measurement. On LA scans, the division between ROI1 and ROI2 was done in the center of the large peg. On AP scans, the division between ROI3 and ROI4 was done in the intercondylar area