Aim: Report epidemiological analysis of hip replacement in Tartu University Clinics. Materials and Methods: During 1990–2001, altogether 2103 operations of total hip arthroplasty were performed at Tartu University Clinics. The primary total hip arthroplasty was performed in 1980 patients (average age 63.0 years), 1238 of them were women (62.5%) and 742 were men (37.5%). Revision operations were made in 118 (in 22 cases the primary operation were performed before 1990), rerevisions in 5 and reoperations on 66 hip joints. Primary osteoarthrosis (86.2%), trauma (7.0%), arthritis (3.2%) were the indications for the operation. Mainly were used Lubinus IP, SP II and Classic Plus types prostheses, total of 1788 cases (90.3%). In 88 (4.4%) cases were used uncemented Zweymüller implants. Results: The follow-up period after primary surgery was up to 12 years (mean 4.0 years). Revision operations made up 4.8% of primary operations in the twelve-year period. Sivash, Gertchev or Cristiansen prostheses were the indications for revision in 22 cases. The indications for revision in the remaining 101 cases were: aseptic loosening 63 (62%), deep infection 23 (23%), dislocation 7 (7%), fractures 4 (4%) and other reasons 4 (4%). All 5 re-revisions were performed in aseptic loosening group. Conclusions: Revision operations made up 4.8% of primary operations in the twelve-year period (mean 4.0 years).