Thorn-induced arthritis.
D001168:Arthritis / Q000209:etiology*; D001170:Arthritis, Infectious / Q000209:etiology*; D002648:Child; D004756:Enterobacteriaceae Infections / Q000209:etiology*; D005547:Foreign Bodies / Q000150:complications*; D006801:Humans; D007719:Knee Joint; D008297:Male