[A new location of osteochondritis: the os trapezium. Apropos of a case].

The authors report a case of osteochondritis dissecans of the trapezium in a 10 year old boy. The main symptom was pain. X-Rays showed osteosclerosis and diminished volume of the trapezium. Magnetic resonance imaging confirmed the diagnosis. At six months, the patient was almost asymptomatic and at one year, X-Rays and the MRI were judged normal. This localisation has never been reported before. The treatment was conservative. Remission was complete.