<prompt> A 45-year-old was given steroids after renal transplant. After 2 years he had difficulty in walking and pain in both hips. Which one of the following is most likely cause?Primary OsteoarthritisAvascular necrosisTuberculosisAluminum toxicity  <response>: Ans. B. Avascular necrosisMnemonic for causes of avascular necrosis other than fracture - SCLERAa. S-Steroidsb. C-Caissons diseasec. LE - Lupus Erythematosusd. R-Radiatione. A-Alcohol 