['Thromboembolic events (TEE) are serious complications after total hip (THA) and knee arthroplasty (TKA), with reported in-hospital incidences of about 0.5-1% for venous thromboembolic events (VTE) and 0.2% for myocardial infarctions (MI) and stroke. However, little data exist on in-hospital TEE when using a standardized fast-track protocol with early mobilization.', 'A large detailed cohort study in primary unilateral THA and TKAs on "early" (in-hospital or after discharge but within 1week of surgery) and 30-days TEEs, including prospective recording of patient characteristics, complete follow-up through the Danish National Patient Register, and detailed evaluation on disposing factors and consequences of "early" TEEs through review of medical records.', 'In 13,775 procedures with a median LOS of 2days, 43 (0.32%; 95% CI: 0.23-0.42) "early" and 90 (0.65%; 95% CI: 0.53-0.80) 30-day TEEs were recorded. "Early" TEEs consisted of 9 (0.07%; 95% CI: 0.04-0.13) MI, 10 (0.08% 95% CI: 0.04-0.13) strokes, 13 (0.09%; 95% CI: 0.05-0.16) pulmonary embolisms and 11 (0.08%; 95% CI: 0.04-0.15) deep venous thromboses. Most TEEs were in patients with irreversible dispositions (e.g. previous TEE, high age and cardiac disease), but 5 of 9 MIs were associated with postoperative anemia. All in-hospital VTE (n: 16) occurred while patients received recommended thromboprophylaxis.'] Do early thromboembolic events ≤1week after fast-track total hip and knee arthroplasty?