The outcome of the study was that DVT occurred in TKA patients 3-5 days after the operation. The inner diameter of the deep vein of lower limbs was observed from bottom to top along with the operation site, and DVT was diagnosed if the following phenomena occur: The lumen below the embolic site is enlarged, and the venous lumen cannot be closed. There is a solid echo with unequal intensity in the lumen. When the occlusion is complete, pulse and color Doppler show a small amount or no blood flow signal.
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