“…The typical clinical features of HO include the limited range of motion around the involved joint, complete bony ankylosis in severe cases, and deformity in the cervical spine, elbow, shoulder, fingers, jaw exostosis, or temporomandibular joint ankylosis (TMJA) ( Zhao et al, 2020 ). HO could occur almost anywhere in the body, as long as it is associated with the periosteum.…”