PURPOSE OF THE STUDY The primary aim of our study was to identify the effects of local application of tranexamic acid (TXA, Exacyl) on the amount of postoperative blood loss and blood transfusion requirement in primary total hip arthroplasty. We also recorded the levels of postoperative haemoglobin and its drop in early period after surgery. In each patient, we monitored in detail the incidence of early complications (haematoma, wound exudate). Lastly, the economic aspect of TXA administration was also taken into account. MATERIAL AND METHODS The prospective study included a total of 312 patients (122 men and 190 women) undergoing primary total hip arthroplasty (THA) at our department between January 2012 and November 2015. The patients enrolled in the study were divided into the intervention group with local (intra-articular) application of TXA and the control group without using TXA. Each group had 156 patients. The mean age of patients in the group with TXA was 65.6 years and the most frequent indication for THA surgery was primary osteoarthritis (59.0 %). The groups did not show any differences in basic characteristics, which was statistically verified. In each patient the volume of postoperative drainage, total blood loss, including the hidden loss, was recorded. In postoperative period, we monitored the haemoglobin levels and haematocrit. On discharge of each patient from the hospital, the size and site of a haematoma, wound exudate if still present even after postoperative day 4 and early surgical revision were evaluated. RESULTS In the group with TXA the blood losses from drains were significantly lower compared to the control group (493.4 ± 357.1 ml vs. 777.3 ± 382.5 ml; p < 0.0001). The median value for total blood loss (i.e. drainage volume and hidden loss) in the group with TXA was by 29.5 % lower than the median in the group without TXA (689.2 vs. 977.1 ml). The mean total blood loss (intraoperative + postoperative) was 783.8 ± 478.6 ml (mean ± standard deviation) in the patients with TXA and 1079.7 ± 487.1 ml in the second group without TXA. The difference in the total blood loss volume was significant (p < 0.0001). In the group with TXA the consumption of blood transfusion was significantly lower by 50 % (20 vs. 40 units), (p = 0.0004). The patients with TXA also reported a significantly lower consumption of allogeneic blood (p = 0.004), a higher level of postoperative haemoglobin (p < 0.0001) and a lower mean drop of haemoglobin (p < 0.0001). We did not observe any significant differences in the incidence of haematomas (p = 0.644). No higher volume of wound drainage and joint swelling after postoperative day 4 in patients with TXA was found (p = 0.565; p = 0.242). The TXA group did not show a higher rate of surgical revision (p = 1.000). The total economic costs of blood transfusion requirements were significantly lower in the TXA group than in the control group (p = 0.004), including consumption of autologous transfusions and blood salvage (p < 0.0001). DISCUSSION The main effect of the local application of TXA is to reduce bleeding which should result in lower postoperative blood loss and consumption of allogenic blood transfusion. The advantage of the local application of TXA is its easy application and maximum concentration of TXA at the surgical site. In addition, a potential harm associated with a systemic administration of a higher TXA dose is reduced because of only minimal TXA resorption into the circulation. According to a number of recent studies, the local application of TXA achieves comparable results to its intravenous application. The economic benefit of TXA intervention is also worth considering. CONCLUSIONS The local application of TXA is an effective and, simultaneously, safe method to reduce perioperative blood loss and consumption of blood transfusions and also to decrease the costs of hospital stay in the patients after THA. Another advantage of the local application is the need to administer one dose only, whereas at least two doses need to be administered intravenously in order to achieve the same effect. No significant complications were observed in the patients with TXA. According to the recent literature, it is therefore appropriate to include the local application of TXA among the recommended procedures for THA, as is the case in total knee arthroplasty. Key words: tranexamic acid, local application, blood loss, hidden blood loss, THA, total hip arthroplasty, complications.