Background: Os trigonum (OST) is commonly located on the posterior aspect of the talus. It occurs as a result of secondary ossification center failing to fuse with the lateral tubercle of the posterior process of the talus; its incidence varies between 2 and 25%. and is more often bilateral. It occurs as an intra-articular Os. https://parisnaturalfoodes.shop/product-category/whole-bean-coffee/