Objective To investigate the difference in local bone mineral density at knee joint in patients with knee osteoarthritis. Methods The study participants were 44 patients with primary knee osteoarthritis who attended Guangdong Province Traditional Chinese Medical Hospital from March to July 2016, in total 44 knees were studied (22 cases of right knee, 22 cases of left knee). All participants were females, with an age range of 54 to 88 years old (average 68. 6 ±7. 50 years) .The regions of interest (ROIs) were divided into coronal position and sagittal position. Coronal position was divided into 6 regions of interest, which were recorded as ROI 1-6; Sagittal position was divided into 7 ROIs, which were recorded as ROI 1-7. Bone mineral density (BMD) of each region of interest was measured by dual-energy X-ray bone densitometer. At the same time, BMD of lumbar spine and femoral neck were measured. Results In the 44 cases of primary knee osteoarthritis patients, lumbar BMD was 0. 859 ±0. 156 g/cm2 (0. 592 ~
168 g/cm2),and femoral neck BMD was 0. 660 ±0. 112 g/cm2 (0. 436 ~0. 087 g/cm2), Among them,15 cases (34. 1% ) had osteoporosis (T-score < 一2. 5); 23 cases (52. 3% ) had low bone mass ( - 1. 0 < T-score < 2. 5),and 6 cases (13. 6% ) had normal BMD( T > -1.0). The BMD of ROI 1 -6 on the coronal position of the knee joint was: 0. 764 ±0. 176,0. 649 ±0. 177, 0, 871 ±0. 253,0. 984±0. 297,0. 696 ± 0. 143 and 0. 949 ±0. 210 g/cm2,respectively. The BMD of ROI 1-7 on the sagittal position of the knee joint was: 0. 801 ± 0.226,0. 995 ± 0, 272, 0. 964 ± 0.298,0. 942 ± 0. 198,0. 796 ± 0. 157,0, 870 ± 0. 223 and 0. 752±0. 206, respectively. Comparison of BMD in the coronal position area of the knee joint found that the BMD of ROI 1, ROI 2,ROI 3 and ROI 4 were statistically different (P <0. 05),ROI 4 > ROI 3 > ROI 1 > ROI 2). Comparison of BMD in the sagittal position area of the knee joint found that the BMD of ROI 1,ROI 2, ROI 3 and ROI 4 were statistically different (P <0.05). Conclusion Most patients with knee osteoarthritis had osteoporosis. The BMD value of the medial tibial plateau was higher than that of the lateral tibial plateau, the BMD value of the lateral femoral condyle was higher than that of the medial condyle of femur, and the BMD values of the femoral condyle and femoral shaft were higher than those of the tibial plateau, tibia and patella. |