**2. Methods**

This chapter is a descriptive study of FAI anatomy and pathogenesis.

Anatomy figures were drawn by us to explain some anatomical relationships as well as the pathogenesis of FAI. Other figures are photographs and radiographs of patients followed and treated at our university hospital.

Concerning the literature research, the data sources used in our manuscript were PubMed, MEDLINE, and ScienceDirect.

The search terms used were femoroacetabular impingement OR FAI, anatomy, pathogenesis, and hip arthroscopy.

All study types were included, including case reports and review articles. Studies referenced in the selected papers were retrieved individually.
