Multiple joint osteonecrosis: case reportA 58-year-old woman developed multiple joint osteonecrosis during treatment with fluticasone propionate for allergic rhinitis [dosage and time to reaction onset not stated].The woman had a history of hypertension, depression, hypothyroidism and allergic rhinitis. Her regular medications included intranasal fluticasone propionate [Flonase] two puffs each nostril twice a day for several years along with other co-medications. She presented with a 9-week history of gradual knee pain. Upon initial examination, the mild degenerative joint disease was noted. Hence, she received treatment with naproxen and four weeks of physiotherapy was suggested. However, no improvement was noted in her condition. She continued to have knee pain. MRI findings of the left leg revealed a large area of acute bone marrow oedema with abnormal signal intensity in the medial tibial plateau consisting of an insufficiency fracture. For protected weightbearing, she started to use a walker. MRI findings of the right leg showed similar findings to the left leg. Additionally, a linear T2-hyperintense signal was noted with bilateral subchondral sclerotic lesions.The woman was treated with ibuprofen, gabapentin, alendronic acid [alendronate] with physical therapy. After 8 weeks, her knee pain reduced; however, she started to have disabling pain in her left ankle. Hence, L5/S1 left radiculopathy was considered, and she was treated with transforaminal epidural steroid injection. However, the pain did not reduce. An MRI of the left ankle was performed; it showed extensive osteonecrosis with the talus and navicular bones. Further, imaging of knee showed progressive collapse of the medial tibial plateau with varus malalignment and secondary bilateral osteoarthritis with stage 4 disease progression. A multiple joint osteonecrosis was confirmed by bone histopathology, and was attributed to her long-term fluticasone propionate use. Hence, she was admitted and underwent staged bilateral total knee arthroplasty (TKA.) Post-TKA, significant improvement was noted in her condition. Later, her left ankle was treated with a solid ankle-foot orthosis. The osteonecrosis progressed secondary to the degenerative arthritis of the tibiotalar and subtalar joints [outcome not stated].