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Case Reports
. 2009 Apr;17(1):103-8.
doi: 10.1177/230949900901700123.

Infectious arthritis of the knee caused by Mycobacterium terrae: a case report

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Free article
Case Reports

Infectious arthritis of the knee caused by Mycobacterium terrae: a case report

B W Milne et al. J Orthop Surg (Hong Kong). 2009 Apr.
Free article

Abstract

Mycobacterium terrae is ubiquitous in our environment. M terrae infections most commonly involve tendon sheaths, bones, bursae, and joints. We report a case of infectious arthritis of the knee caused by M terrae in a 21-year-old man who had non-specific chronic synovitis. No organism was seen on microscopy or isolated from cultures until months later. Initially the M terrae culture was considered a contaminant and specific anti-mycobacterial treatment was not advised. The patient was commenced on suppressive therapy for persistent effusion and discomfort. Eventually, the M terrae infection was confirmed and he was commenced on clarithromycin, ciprofloxacin, and ethambutol. The triple antibiotic regimen was continued for 2 years. The knee improved but never completely settled. The patient chose to cease all antibiotic medication. The knee remained swollen and irritable, with little chance of eradicating the organism.

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