Fig. (1) Bone mineral density values were measured in the femoral and tibial condyles. FM: medial femoral condyle; FL: lateral femoral condyle; TM: medial tibial condyle; and TL: lateral tibial condyle. The height of each region of interest (ROI) extended to 2 cm below the joint line. The external border of each ROI extended to the subperiosteal surface of the femur and tibia as determined manually. The patella served as the inner border for the medial and lateral proximal femoral ROIs, and the intercondylar eminences served as the inner border for the medial and lateral proximal tibial ROIs. In the femoral ROIs, care was taken to avoid including the patella in the measurements. In the lateral ROIs, care was also taken to avoid including the fibula in the measurements.