title: Unusual foreign body in the knee joint (with entrapment of the extensor mechanism).
mesh_terms: D000328:Adult; D005547:Foreign Bodies / Q000150:complications* / Q000601:surgery; D006801:Humans; D007718:Knee Injuries / Q000209:etiology* / Q000473:pathology / Q000601:surgery; D007719:Knee Joint; D008297:Male; D014950:Wounds, Penetrating / Q000473:pathology