Experimental Study On The Effect Of Lumbar Vertebral Degeneration On The Accuracy Of Lumbar Spine Bone Mineral Density By Dual Energy X-ray Absorptiometry(DXA)

Objective: The effect of bone hyperplasia and abdominal aortic calcification on the accuracy of DXA bone mineral density was studied by dual energy X-ray absorptiometry(DXA)compared with QCT(quantitative computed tomography).Methods:A total of 140 subjects(aged 50 years and older)were enrolled,and the lumbar vertebrae and right hip bone mineral density were measured using a dual-energy x-ray absorptiometry.The lumbar vertebrae ranged from L1-L4 vertebral body to left hip.The measurement range is the femoral neck,ward's triangle and total hip.Bone mineral density(mg/cm2),T-score and Z-score were recorded for lumbar vertebrae L1-L4 and left hip,respectively.Lumbar spine scans were performed on subjects using QCT(measured in the range of L1-L4 vertebral bodies).Images and measured bone density values(mg/cm3),T-scores,and Z-scores were recorded.According to the CT image of QCT,the severity of lumbar degeneration and abdominal aortic calcification were graded.The effect of lumbar degeneration and abdominal aortic calcification on DXA measurement was evaluated by QCT.Results:There were significant differences in the detection rates of DXA and QCT osteoporosis in age,severe callus formation and abdominal aortic calcification,and different degrees of endplate sclerosis,callus location,and vertebral height loss for DXA and QCT bone.There was no significant difference in the detection rate of quality loosening.Conclusion : In the lumbar spine DXA test,severe osteophyte formation and abdominal aortic calcification will affect the actual results,the detection of the corresponding vertebral body should be avoided in the detection,in assessing the degree of osteoporosis in patients,using QCT test or hip DXA more reliable.The severity of bone hyperplasia and abdominal aortic calcification is positively correlated with age.For elderly patients over 65 years of age,in order to avoid errors,it is recommended to prioritize QCT or hip DXA.