“…Proximal humeral fracture sequelae (PHFS) are a cause of shoulder stiffness, significant chronic pain, and disability. 1 , 2 , 11 , 18 , 19 , 24 In 2001, Boileau et al classified PHFS into 4 main types according to the level of the deformity (intracapsular or extracapsular) and to the status of the tuberosities. 7 In 2012, the same author updated the classification system by adding 4 different subgroups to type 1, that is, type 1A in presence of osteonecrosis, type 1B for post-traumatic arthritis, type 1C and 1D for valgus and varus malunion, respectively.…”