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Introduction Non traumatic osteonecrosis is the ischaemic death of cellular elements within bone. Etiological factors implicated include long term corticiosteroid use, alcoholism, sickle cell disease, systemic lupus erythematosus, amongst others. Common sites of involvement include the proximal femur, knee, shoulder, ankle. Metaphyseal-diaphyseal lesions have been well described radiolographically, however are commonly considered asymptomatic. There is thus a paucity of literature describing techniques used for symptomatic diaphyseal or metaphyseal lesions not involving the epiphyseal region. Case description Our patient is a 40-year-old woman diagnosed with Arnold-Chiari malformation in 2005 who was then surgically treated with foramen magnum decompression. In 2010 she was treated with 4 months of Dexamethasone 2mg for chemical meningitis. She presented to the Orthopaedic outpatient clinic in 2012, 16 months after ceasing steroid medication, with a 6 month history of difficulty walking due to pain in bilateral groins and bilaterally along her shins, left worse than right. MRI of both hips demonstrated anterior serpiginous lesions within the femoral heads consisted with AVN (Ficat II). MRI of lower legs showed isolated bone infarct in the metaphyseal-dyaphyseal region of her tibias bilaterally. She had bilateral total hip arthroplasties with immediate relief of hip symptoms. Our patient underwent bilateral tibial intramedullary nailing using a Stryker T2 nail with a medial parapatellar approach. At both the 6 week and 5 month follow-up she had no further pain, was non tender to palpation and was very satisfied with result. Results and Conclusions We are unaware of any reports of the development of symptomatic diaphyseal osteonecrosis in patients receiving corticosteroids for the treatment of meningitis. Much of the literature regarding management of osteonecrosis is focused on the treatment of epiphyseal lesions in the femoral head and around the knee. Diaphyseal lesions have been well described radiologically but are often defined as asymptomatic and clinically insignificant. Our use of intramedullary nailing thus illustrates an effective surgical option for the treatment of symptomatic diaphyseal osteonecrosis. Take home message Osteonecrosis must be considered in all patients receiving high dose or long term steroids for any indication. Intramedullary nailing can be a successful method of treating symptomatic diaphyseal osteonecrosis of long bones.

Symptomatic steroid induce multifocal diaphyseal bone infarcts treated with intra-medullary nailing