Hello, Systemic  lupus erythematosus (SLE) is classed as an autoimmune condition in which the immune system attacks healthy tissue in the body. SLE is a disease that can affect persons of all ages and ethnic groups and both sexes, but more than 90% of new patients presenting with SLE are women in the childbearing years.  Inflammation caused by SLE can affect various organs including joints. Hip joint is one of he most common joint to get affected. Joint pain or arthritis is experienced by 95% of people with lupus at some time during the course of their disease. In fact, joint pain is usually the first symptom of lupus.  When a particular joint is affected on one side of the body, the same joint on the other side of the body is usually affected as well. You seem to have developed bone tissue death of hip joint called as avascular necrosis. Although before suggesting hip replacement surgery,doctors try medications along with physical therapy. But ,it seems that these options have been exhausted and destruction of hip joints is far advanced.It seems hip replacement surgery would be ideal for you and that is the reason you have been advised this surgery however,you should take opinion from some other orthopedic surgeon regarding this.   In the past, hip replacement surgery was an option primarily for people over 60 years of age. In recent years, however, doctors have found that hip replacement surgery can be very successful in younger people as well. New technology has improved the artificial parts, allowing them to withstand more stress and strain.  Thanks.