Unfortunately, not all hip replacements will last indefinitely. Whilst a well-performed hip replacement can expect to have a survivorship of 90% at twenty years, some replacements will fail sooner than others. Reasons for failure include infection, aseptic loosening, excessive wear, recurrent dislocation or fractures around the implants that have been used.
Revision hip surgery is more complex than primary hip replacement surgery. This is because the tissues are scarred and damage has been created in that area giving rise to the eventual failure of the joint, and the risks are therefore increased concomitantly. Sometimes a revision can be quite straightforward and only one part of the joint requires replacing. At the other end of the extreme, the entire joint has to be replaced and significant bone grafting or the use of supplemental materials is also invoked. The risks of infection, damage to arteries or nerves, fractures, clots and haemorrhage are all increased.
This is a special part of orthopaedic surgery that has formed the basis of a sub-specialty. Some surgeons perform more than others. There is an old saying that good orthopaedic surgery comes from experience. Experience comes from bad orthopaedic surgery. You may consider asking your surgeon about his or her experience and competence with this special branch of hip surgery.