P11 Multiple insufficiency fractures in rheumatoid arthritis

Abstract Case report - Introduction Rheumatoid arthritis (RA) is an autoimmune inflammatory arthropathy with systemic manifestations. It is 4-times more common in females. RA is recognised to induce bone loss and decrease in bone mineral density (BMD). Management may include corticosteroids (CS) for new presentations, acute flares, and more rarely longer-term management, which increases bone fragility. Patients are at 30—50% increased risk of developing osteoporosis with a 30% increase in fracture risk. This risk rises with the level of persistent disease inflammation. We present a case of a lady with longstanding RA, who sustained multiple bone fractures without significant osteoporosis on bone density scanning. Case report - Case description Our patient is a 64-year-old headteacher who took early retirement due to reduced mobility after 20 years of seropositive RA. She had received multiple disease modifying drugs (DMARDs) and biologics therapies, requiring repeated alterations primarily due to treatment failure. She was commenced on alendronic acid due to osteopaenia of the hip but 2 years later sustained a fractured neck of femur and was switched to risedronate. A year later she presented with acutely painful and swollen right foot and ankle without history of trauma. X-rays showed progressive degenerative change whilst inflammatory markers were normal. Ultrasound demonstrated sub-clinical synovitis. Her medication was optimised but the ankle swelling persisted, rendering her wheelchair-reliant. MRI revealed multiple stress fractures involving calcaneum, talus and 5th proximal phalanx. She was treated with 16 weeks of an Aircast boot. An old right upper medial tibial fracture was also identified. Repeat dual energy X-ray absorptiometry (DEXA) scan showed osteopaenia but with improvement from the previous scan (T score of -2.1 total hip and -1.6 lumbar vertebra). She smoked 1 cigarette a day, did not drink alcohol and there was no parental history of fractures. No evidence of malabsorption or endocrine disorder was identified. Unusually, she had received tamoxifen in her late 20s for cancer prevention based on breast fibroadenosis and she experienced early menopause aged 36 years. Inflammatory markers, calcium, parathyroid hormone, and immunoglobulins were normal. Vitamin D3 levels were insufficient at 40.3 nmol/l and replacement was initiated, following which she was switched to intravenous zoledronic acid. After one infusion of zolendronate, she twist