Contralateral osteonecrosis of the femoral head newly developed after increasing the dose of corticosteroids

Abstract

Nontraumatic osteonecrosis of the femoral head (ONFH) is a debilitating disorder that commonly affects 30to 50-year-old individuals, with corticosteroid use being one of the major causative factors [1]. Although the precise pathogenesis of corticosteroid-induced ONFH remains unclear, both high-dose oral corticosteroid therapy and corticosteroid pulse treatment have been reported to be risk factors, highlighting the importance of the dose of corticosteroids in the development of corticosteroid-induced osteonecrosis [2–7]. Corticosteroid-induced osteonecrosis often affects both femoral heads (50–70 %), and bilateral ONFH is considered to develop concurrently [1, 2]. In contrast, in patients with unilateral ONFH, it is rare that new osteonecrotic lesions subsequently develop in the contralateral femoral head. To our knowledge, there are no reports in the literature regarding the development of new corticosteroidinduced ONFH lesions on the contralateral side. Here we report the case of a patient who developed new ONFH in the contralateral hip after increasing the dose of corticosteroids for a different underlying disease. We clearly indicate that written informed consent for publication was obtained from the patient. Case report