title: Gouty tophi caused limited knee range of motion: a case report.
abstract: BACKGROUND
  Gout is a disease of purine metabolism characterized by monosodium urate crystal deposition. Gouty tophi can mimic many conditions such as infection or neoplasm.
  
  
  OBJECTIVE
  We descriptively presented a case of a 29-year-old male with gouty toph. Data was obtained from patient chart. This patient presented with limited knee joint range of motion after sport injury. Arthroscopic examination was performed in order to confirm the diagnosis of the meniscal injury.
  
  
  RESULTS
  The result showed the synovium with white toothpaste-like chalky urate crystals in the joint cartilage.
  
  
  CONCLUSIONS
  An atypical presentation of gouty tophi can sometime mislead to diagnose an internal derangement of the knee.
authors.affiliation: Department of Orthopaedics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand. rackn@mahidol.ac.th
authors.forename: Chusak
authors.initials: C
authors.lastname: Kijkunasathian
authors.forename: Patarawan
authors.initials: P
authors.lastname: Woratanarat
authors.forename: Nadhaporn
authors.initials: N
authors.lastname: Saengpetch
mesh_terms: D000328:Adult; D000493:Allopurinol / Q000627:therapeutic use; D015210:Arthritis, Gouty / Q000150:complications / Q000175:diagnosis* / Q000188:drug therapy; D001182:Arthroscopy / Q000379:methods; D003937:Diagnosis, Differential; D006074:Gout Suppressants / Q000627:therapeutic use; D006801:Humans; D007718:Knee Injuries / Q000175:diagnosis*; D007719:Knee Joint / Q000000981:diagnostic imaging; D008279:Magnetic Resonance Imaging; D008297:Male; D009288:Naproxen / Q000627:therapeutic use*; D011859:Radiography; D016059:Range of Motion, Articular; D013583:Synovial Membrane / Q000737:chemistry / Q000000981:diagnostic imaging; D016896:Treatment Outcome; D014527:Uric Acid / Q000097:blood
chemical_list: D006074:Gout Suppressants; D014527:Uric Acid; D009288:Naproxen; D000493:Allopurinol