Composite transplants involve multiple tissues, usually including skin and soft tissues and sometimes musculoskeletal structures. Many of these procedures are now possible because of advances in immunosuppressive therapy. However, the procedures are ethically controversial because they typically do not extend life, are very expensive and resource-intensive, and can potentially cause morbidity and mortality due to infections.
The first successful composite transplants were hand transplants. Since then, perhaps as many as 10 different structures have been replaced in about 150 patients, with varying functional success rates.
The first hand transplantation was done in 1998. Since then, double hand and upper-extremity transplantations have been done. Recovery of the hand function varies widely; some recipients regain enough function and sensitivity to do daily activities.
A transplant is an organ, tissue or a group of cells removed from one person (the donor) and transplanted into another person (the recipient) or moved from one site to another in the same person. A skin graft is a common example of a transplant from one part of a person's body to another part.