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We observed the blood flow in the femoral vein and greater saphenous vein using color Doppler ultrasonography after orthopaedic lower extremity operation. Between March 1999 and February 2000, 108 patients underwent 18 total knee arthroplasties, 46 total hip arthroplasties, and 44 hip osteotomies. We performed venous duplex ultrasonography twice on both lower extremities of all patients at a mean of seven days (range; five to eight days) and fourteen days (range; twelve to fifteen days) postoperatively. There were 25 male and 83 female patients with a mean age of 55 years (age range; 20 to 84 years). Greater saphenous blood flow increased in 49 (23 percent) of the 216 extremities. Thirty-two were ipsilateral, and 17 were contralateral. We suggest that these findings indicate asymptomatic deep venous thrombosis. With the numbers available, we were able to detect an association between an increase in the greater saphenous venous flow and procedures (P<0.01). This study provides further evidence of the importance of prophylaxis against thromboembolism following total arthroplasty.

Postoperative Findings for Lower Extremity Blood Flow with Duplex Ultrasonography.