A 58-year-old man from Mumbai with a 20-year history of rheumatoid arthritis (RA) on long-term corticosteroids (prednisolone 7.5 mg daily for 8 years) presents with sudden-onset severe back pain and inability to stand. He reports no recent trauma. On examination, he is cachectic (BMI 19 kg/m²), with active synovitis of hands and knees. Vertebral tenderness is elicited at T8. Plain radiographs show a crush fracture of T8 with severe loss of vertebral body height and retropulsion of bone into the spinal canal. Serum calcium 7.9 mg/dL, phosphate 3.2 mg/dL, albumin 3.2 g/dL. DEXA scan shows T-score of −3.2 at lumbar spine and −2.9 at femoral neck. MRI spine shows cord compression at T8. What is the most appropriate next step in management?