An Extremely Rare Case of Extensive Myositis Ossification: Complete Extra-Articular Ankylosis of Hip Joint

Myositis ossificans, in its literal translation, is defined as an inflammatory ossification of muscle and the neighboring soft tissues. A rare case of post-brain injury ossification of the Gluteus maximus muscle extending from the greater trochanter of the femur to the right wing of the iliac bone, leading to extra-articular bony ankylosis of the hip is reported. A 40-year-old male presented to the Outpatient department with a stiff right hip and restriction of its movements. The patient had a history of cerebral hemorrhage 18 months back and subsequently developed stiffness in the right hip since the last 3 months. X-ray and CT scan revealed the extension of an ossified bar extending between the lateral aspect of the right iliac wing above the right acetabulum and upper 1/3 of the anterior lateral aspect of the femur near the greater trochanter, measuring 1003240 mm. The patient was then allowed to go for rehabilitation with appropriate physiotherapy and anti-inflammatory drugs. Extensive hypertrophic ossification can occur at a totally unrelated site as a consequence of cerebral insult/ head injury.