“…The exact mechanism of ON is still unclear, some mechanisms involved include ischaemia, vascular occlusion, intraosseous microcirculation coagulation, and mechanical stress [ 1 ]. There are multiple risk factors and medical condition associated with ON, including trauma, alcohol abuse, smoking, vascular disease, renal disease, coagulation disorders, and rheumatic diseases, especially in systemic lupus erythematosus (SLE) [ 1 , 2 ].…”