Synovitis secondary to penetrating plant thorn injuries is not frequently reported. Historically, it is considered aseptic
and treated with removal of the intraarticular foreign body and affected synovial lining. We report a 57-year-old healthy
man who was admitted 2 weeks after being injured by a rose (Rosacea) thorn with subacute and mild synovitis with effusion
of his right knee. No intraarticular foreign body was retained. Pantoea agglomerans was identified in the synovial fluid.
Contrary to former teaching, effusions from joints violated by thorns should not be presumed sterile. Bacterial growth is
reported infrequently, but when reported, Pantoea agglomerans is the most common organism found. We recommend removal of foreign
bodies if present, arthroscopic total synovectomy, and beginning empiric antibiotic treatment with coverage against Gram-negative
enteric pathogens in all cases of thorn synovitis until the results of culture specimens are known. Improved physician awareness
can result in more rapid diagnosis and improved clinical outcome in affected individuals.
The author certifies that he has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing
arrangements, etc) that might pose a conflict of interest in connection with the submitted article.
The author certifies that his institution has approved the reporting of this case and that all investigations were conducted
in conformity with ethical principles of research.