It is important to have a check X-ray following hip replacement surgery to check for complications such as perforation of the femoral shaft by the stem of the prosthesis.
Femoral stem malpositioning can result in having to undergo two further hip surgeries, i.e. two stage revision surgery.
When hip and knee replacements do fail it tends to be because of infection, wear and tear and, more rarely, because they have broken. This means patients require revision surgery which is more likely to fail.