Pyogenic tenosynovitis of the flexor hallucis longus in a healthy 11-year-old boy: a case report and review of the literature.

Pyogenic tenosynovitis of the flexor hallucis longus (FHL) is a rare condition in young healthy patients. We report the case of a healthy 11-year-old boy who presented with a history of fever and painful swelling below the medial malleolus of the left ankle. Imaging and laboratory findings suggested infectious tenosynovitis of the FHL. Methicillin-sensitive Staphylococcus aureus was isolated on culture following surgery. Antibiotherapy was initiated and continued until inflammatory markers returned to normal. Six months post-surgery, he resumed sport activities and inflammatory markers remained within normal limits. We review also the literature and discuss the clinical characteristics of this condition.