Antoniel et al. [98] examined biopsies of the pedidium tendon from a UCMD patient with a heterozygous COL6A1 mutation and of the piriformis tendon from a BM patient with heterozygous COL6A2 mutation who had a femur fracture surgeryand compared them with two biopsies of similar tendons from controls who had surgery for other reasons. This evidence concerns the gene COL6A1 and Congenital muscular dystrophy, Ullrich type.