The definition of atypical femoral fractures should include periprosthetic femoral fractures (PAFFs). - Makkar B; Obremskey W; Avidano R; Ott S; Basida B; Hoffer C; Schousboe JT; Lo J; Huling J; Ristau K; Fink HA; Adler RA; et al. (Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA, 2025)