title: [Clinical diagnosis of Colles fracture combined with dorsal subluxation of radial carpal joints].
abstract: OBJECTIVE
  To study the criteria for evaluating Colles fracture combined with dorsal radiocarpal subluxation (DRS).
  
  
  METHODS
  Fifty cases of Colles fracture combined with DRS, 100 cases of simple Colles fracture without DRS, and 100 normal wrist joint controls were included. We analysed central point displacement and perpendicular line ratio on the lateral view X-ray. For comminuted and severely displaced fracture, central point displacement (CPD) was not adopted because of difficulties in identifying the central point of the articular surface. Perpendicular line ratio (PLR) was suggested.
  
  
  RESULTS
  Prominent difference was seen in the CPDs and the PLRs between the Colles fracture combined with DRS group and the simple Colles fracture and the normal control group (P < 0.01). Prominent relevance between the CPD and the PLR was also found (P < 0.05).
  
  
  CONCLUSIONS
  Central point displacement and perpendicular line ratio can be regarded as the diagnostic criteria for Colles fracture combined with DRS. PLR is especially valuable when the central point is hard to be identified in very comminuted and severely displaced fractures. DRS is suggested when CPD is more than 2.5 mm and PLR is less than 0.76.
authors.affiliation: Traumatology & Orthopedics Department, Jishuitan Hospital, Beijing 100035.
authors.forename: X
authors.initials: X
authors.lastname: Gong
authors.forename: G
authors.initials: G
authors.lastname: Rong
authors.forename: X
authors.initials: X
authors.lastname: Geng
authors.forename: G
authors.initials: G
authors.lastname: An
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003100:Colles' Fracture / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D014954:Wrist Injuries / Q000000981:diagnostic imaging*