In my opinion, the risks of resurfacing using metal on metal implants outweigh the benefits. I believe that there are potential long-term complications associated with the production of metal wear debris. There is evidence that heavy metals such as cobalt and chromium enter the bloodstream. This may reduce the body's resistance to infections (reduced immunity). Some patients may also develop allergic reactions to metal particles and in some cases, the genetic material in cells around the hip replacement may become damaged.
The main advantage of hip resurfacing relates to the lower dislocation rate allowing patients to return to more vigorous activities, however, there are safer alternatives.