Arthroplasty registries represent a fundamental tool for the production of evidence in total joint replacement. Italy started in 2005 a national registry (Italian Arthroplasty Registry - RIAP) organised as federation of regional registries under the coordination of the Istituto Superiore di Sanità. However, data collection still appears to be hardened by the additional workload required from clinicians. The aim of the study was to evaluate the data entry times for an inexperienced operator and the relative learning curve. The analysis carried out shows that after 15 cases, a plateau of about two minutes is reached for the compilation of a single case of primary hip and knee arthroplasty, up to 4 minutes for the shoulder and for revision surgery. The work burden for the orthopedist does not seem to justify the reluctance in data collection observed in these years of RIAP experience.