Periostitis blade of a horned dinosaur. Periostitis Periostitis, also known as periostalgia, is a medical condition caused by inflammation of the periosteum, a layer of connective tissue that surrounds bone. The condition is generally chronic, and is marked by tenderness and swelling of the bone and pain. Acute periostitis is due to infection, is characterized by diffuse formation of pus, severe pain, constitutional symptoms, and usually results in necrosis. It can be caused by excessive physical activity as well, as in the case of medial tibial stress syndrome (also referred to as tibial periostalgia, soleus periostalgia, or shin splints). Congenital infection
Operational Stress Injury emotional injury suffered by soldiers in the course of their service. The term was designed to expand the understanding of mental health disorders related to service beyond just PTSD, and to include other clinical diagnoses linked to trauma. The word 'injury' was chosen to help shift the view of these disorders in order to extend to them the same legitimacy in discourse as physical injuries, and to help reduce the stigma surrounding mental health. Not a diagnosis itself, operational stress injury was described by the Canadian Forces as a “grouping of diagnoses that are related to injuries that occur as