Atraumatic Myositis Ossificans of Iliopsoas Excised through an ASIS Osteotomy: Case Report and Description of a Novel Technique.

With a well-established incidence of 15% to 20% following a spinal injury, the occurrence of neurogenic myositis ossificans of the hip is quite rare. The most widely accepted theory supporting its occurrence is the repeated microtrauma by forceful passive mobilization during rehabilitation. An extensive involvement around the hip is quite disabling to the patient. We present the case of a 41-year-old man with an extensive involvement of the right iliopsoas following an incident of head injury with no primary injury to the hip, with a disabling restriction of movement. Computed tomography images and its 3D reconstruction were used to define the exact extent of involvement. The mass was excised piece meal using the iliofemoral approach with an osteotomy of the anterior superior iliac spine, which allowed us to have a better visualization to the extensive mass. Postoperatively the patient regained a good range of motion. In addition to adding a rare case of atraumatic myositis ossificans of the iliopsoas to literature, this reports describes a novel approach for its excision.