Ishak MA, Morley KD.
Deep venous thrombosis after total hip arthroplasty: a prospective controlled study
to determine the prophylactic effect of graded pressure stockings.
Br J Surg 1981 Jun;68(6):429-32

Graded pressure stockings significantly reduced the incidence of venographically
determined deep venous thrombosis (DVT) after total hip arthroplasty. Seventy-six
patients were studied; the incidence of DVT was 54 per cent in 41 control patients
and 20 per cent in 35 patients who wore stockings. Administration of blood during
the operation and in the first 24 h after operation, if given in excess of blood
loss, was associated with a significantly increased risk of developing DVT. The
application of graded pressure stockings and the avoidance of unnecessary
perioperative blood transfusion are worth while in the management of total hip
arthroplasty.