1. Ekelund A, Brosjo O, Nilsson OS (1991) Experimental induction of heterotopic bone. Clin Orthop Relat Res 263:102–112
2. Kaplan FS, Hahn GV, Zasloff MA (1994) Heterotopic ossification: two rare forms and what they can teach us. J Am Acad Orthop Surg 2(5):288–296
3. An HS, Ebraheim N, Kim K, Jackson WT, Kane JT (1987) Heterotopic ossification and pseudoarthrosis in the shoulder following encephalitis. A case report and review of the literature. Clin Orthop Relat Res 219:291–298
4. Damanski M (1991) Heterotopic ossification in paraplegia. A clinical study. J Bone Joint Surg Am 43B:286–299
5. Wenner SM (1986) Heterotopic ossification of the shoulder following head injury. A case report. Clin Orthop Relat Res 212:231–236