OBJECTIVE: The aim of this paper was to examine whether there is a difference in the frequency of dislocation between the two groups of patients, one of whom had the primary endoprosthesis, and the second with revision hip endoprosthesis. is the aim was also to examine whether there is a difference in the frequency of luxation depending on the model of implanted endoprosthesis, the treatment method, age, gender and the affected side of the body in the two groups of patients. STUDY DESIGN: cross-sectional study PARTICIPANTS AND METHODS: The research included 58 patients with a postoperative dislocation (primary and revision) of both genders and all age groups treated at the Department of Orthopedics at Clinical Hospital Centre Osijek from 2011 to 2016. The data from the discharge documents, history and the outpatient journals have been processed from the medical records of the Department of Orthopedics at Clinical Hospital Centre Osijek. RESULTS: There is no statistically significant difference in the incidence rate between primary and revision total hip endoprosthesis. Most of the patients with dislocated primary and revision endoprostheses are female, 83 %. The most commonly implanted and dislocated model of endoprosthesis is Duraloc + Corail (Johnson & Johnson), but there is no significant statistical difference between the endoprosthesis model by the frequency of dislocation. Older individuals have a higher risk of dislocation. The most commonly used method for dislocation treatment is closed (repositio non cruenta) reposition with 57 %. CONCLUSION: The most commonly used endoprosthesis model is Duraloc + Corail (Johnson & Johnson). The most common dislocation treatment method is closed (repositio non cruenta) reposition. The lowest number of dislocations occur in the age group of 60 to 69 years, and the highest in persons over 80 years. There are no significant differences in the number of dislocations according to sex, side of the body, and the type and model of endoprosthesis.