MYCOBACTERIUM-CHELONAE INFECTION FOLLOWING A TOTAL KNEE ARTHROPLASTY

Infection following total knee arthroplasty is a major cause of implan t failure, with an incidence of infections between 1 and 12%. Although there have been no previously reported cases of infection with Mycoba cterium chelonae following total knee arthroplasty, this mycobacterium appears to be a potential pathogen in arthroplasty. When infection fo llowing total knee arthroplasty is evident but standard cultures come back negative, atypical mycobacterium infection should be considered. Mycobacterium chelonae does not grow in the normally allotted culture time, so false negative results are common. Once identified, M. chelon ae is difficult to treat because of its resistance to standard drug th erapies. Details of the first reported successful diagnosis and treatm ent of an infection with M. chelonae following a total knee arthroplas ty are reported.