Objective To explore the application value of ultrasound in the diagnosis and curative effect evaluation of knee joint diseases in elderly rheumatoid arthritis.MethodsSixty-five elderly rheumatoid arthritis patients were selected as the study group

and another 35 normal elderly people were selected as the control group.The classification of color blood flow in the knee joint

the classification of hydrops in the suprapatellar capsule

the classification of synovium thickness

and thickness of hydrops in the suprapatellar capsule

synovial thickness

cartilage thickness between the two groups were observed and compared by ultrasonography.The patients in the study group received standardized treatment for 3 months

then the therapeutic effect was evaluated by ultrasound.ResultsThe classification of color blood flow

classification of hydrops in the suprapatellar capsule and classification of synovial thickness in the knee joints of the study group were statistically different from those of the control group（all P<0.05）.There were significant differences in the thickness of hydrops in the suprapatellar capsule and synovium between the study group and the control group（both P<0.05）

while there was no significant difference in the thickness of intercondylar cartilage.After treatment

the thickness of hydrops in the suprapatellar capsule and synovium thickness of the study group patients were significantly decreased than those before treatment

and the color blood flow signal was reduced（all P<0.05）

while the intercondylar cartilage thickness was not significantly changed.Conclusion By detecting the thickness of hydrops in the suprapatellar capsule

synovium thickness and blood flow signal of the knee joint in the elderly RA patients

ultrasound can be used for the evaluation of its curative effect

which is worthy of clinical promotion.