Foreign body (palm thorn) in knee joint.
A child who lives in a semitropical or tropical zone and has monarticular symptoms involving the knee joint and a history of playing in the vicinity of plams should be examined for the possibility of a palm thorn within the joint. The diagnosis, made after careful elimination of more common entities, can only be confirmed by surgical exploration.
D002140:California; D002648:Child; D002675:Child, Preschool; D005547:Foreign Bodies; D006801:Humans; D007719:Knee Joint; D008297:Male; D010944:Plants