Summary
Plasma levels of D-dimer have been found useful as a marker of deep venous thrombosis
in those patients in whom thrombosis is suspected, but their usefulness in postoperative
screening is less clear. We have investigated the relationship of D-dimer to deep
venous thrombosis in 90 patients after total hip and knee arthroplasty. From the first
postoperative day the D-dimer levels were found to be highly significantly raised
in patients with deep venous thrombosis. A combined result over the first six postoperative
days in excess of 1200ng/ml correlated with thrombosis with a specificity of 100%,
sensitivity of 45%, positive predictive value of 60%, and negative predictive value
of 100%. However, individual estimations were not discriminatory.