**1. Introduction**

By 2030, the demand for primary total hip arthroplasty in the United States of America is estimated to grow by 174% and the demand for primary total knee arthroplasty is projected to grow by 673%. Overall, total hip and total knee revisions are projected to grow by 137% and 601%, respectively, between 2005 and 2030 [1]. This estimate demonstrates that joint problems, especially those correlated with population aging, are an important public health problem. The queues for performing arthroplasties in developing countries are among the longest in the health systems of countries such as Brazil. Governments around the world will need to take steps to ensure assistance with public policies aimed at increasing patients' access to treatment with surgery for joint reconstruction.

On the other hand, it is important to emphasize that arthroplasty is a very effective surgery, which resolves pain in most cases and restores mobility, functional independence, and quality of life for the patient. No wonder hip arthroplasty was elected the most important surgery of the twentieth century [2].
