Thrombosis of the Deep Leg Veins Due to Prolonged Sitting

"SPONTANEOUS" thrombosis, according to DeCamp, Landry, Ochsner and DeBakey,1 represents between 4 and 5 per cent of all venous thrombosis in the limbs (the lower limbs almost exclusively). The very word indicates that the conditions under which the disease occurs in ambulatory persons have not been recognized. How sudden muscular efforts and strains may cause thrombosis in the deep lower-leg veins of even young and active men has been pointed out by Crane,2 but such an influence is as often absent as present. Perhaps Naide's3 account of thrombosis in tall men gives a better hint of the nature of the . . .