Fibrodysplasia ossificans progressiva - An uncommon cause of trismus

Abstract

Fibrodysplasia ossificans progressiva (FOP) is a progressively disabling genetic disorder. It is characterised by development of a secondary skeleton due to progressive hypertrophic ossification. It causes immobility through progressive conversion of skeletal muscle and soft connective tissue into a second skeleton of heterotopic bone. Approximately 1 in 2 million children worldwide are diagnosed with FOP. We present the case of a person erroneously referred for physical therapy of trismus.