“…is commonly used during surgical procedures under general anaesthesia (GA) to reduce the risk of heel pressure ulcers originating in the operating theatre. 4 Heel elevation (e.g., using silicone blocks 5,6 ) is likely to cause knee hyperextension, with consequent popliteal vein compression, and this may in turn increase the risk of deep vein thrombosis (DVT). DVT is itself a widespread health-care issue with an incidence of 1 in 1000 of the general population 7,8 and at least 7% in the perioperative period.…”