ABSTRACT
Myositis ossificans is calcification, or ossification, in part of a muscle. It is an uncommon condition that may follow an injury that has caused extensive intramuscular haemorrhage, sometimes associated with a fracture of the adjacent bone. Bone pain and joint pain are often ‘diffuse’ and poorly localized. A ‘greenstick’ fracture is a type of incomplete fracture that is common in childhood, in which the bone buckles like a bent green twig, but the periosteum and bone ends remain in continuity. Tendons can be ruptured by direct violence, especially if they have been weakened by rubbing over a bone, which causes attritional wear. Bone can become infected by organisms that reach it through the bloodstream or directly through a wound. The tumour has a red fleshy appearance and consists of multinucleate giant cells in a background of stromal cells that extend into the surrounding bone.
