title: Quantification of acromioclavicular reduction parameters after the Weaver-Dunn procedure.
abstract: BACKGROUND
  The combination of the reconstruction of the coracoclavicular ligaments with the resection arthroplasty of the distal end of the clavicle is a commonly used technique in acromioclavicular separations.
  
  
  OBJECTIVE
  The purpose of the current study was to quantify the reduction parameters using 3-D CT and to analyze their effects on clinical outcomes.
  
  
  METHODS
  Case series.
  
  
  METHODS
  The patients with chronic symptoms after acromioclavicular dislocation (type III) were treated with reconstruction of the coracoclavicular ligaments. The average follow-up was 69.5 months. The patient group consisted of 21 men and 8 women. The initial treatment at the time of injury was nonoperative in 26 of 29 patients. CT was used to document anteroposterior (APD), craniocaudal (CCD) and mediolateral (MLD) acromioclavicular reduction parameters. Constant Shoulder scoring system was used.
  
  
  RESULTS
  The mean preoperative Constant score was 56.62 +/- 18.63 points while the postoperative score was 89.93 +/- 10.79 points. The mean APD was 9.2 mm, the mean CCD was 1.1 mm and the mean MLD was 8.4 mm. There was no correlation between the APD, MLD and the Constant Scores. However, an inverse correlation between the CCD and the postoperative Constant Scores was found.
  
  
  CONCLUSIONS
  CCD plays an important role on the postoperative function. If the CCD is larger, the Constant score is lower.
  
  
  CONCLUSIONS
  The reduction loss is a distinctive parameter of the functional outcome, even when the reconstructed coracoclavicular ligament is intact. Secure fixation may be achieved with techniques preserving CCD.
authors: Department of Orthopaedic Surgery, Faculty of Medicine, Marmara University, Istanbul, Turkey.
authors: Murat
authors: M
authors: Bezer
authors: Baransel
authors: B
authors: Saygi
authors: Nuri
authors: N
authors: Aydin
authors: Fatih
authors: F
authors: Kucukdurmaz
authors: Gazanfer
authors: G
authors: Ekinci
authors: Osman
authors: O
authors: Guven
mesh_terms: D000173:Acromioclavicular Joint / Q000000981:diagnostic imaging* / Q000293:injuries / Q000601:surgery; D000328:Adult; D002968:Clavicle / Q000601:surgery*; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D004204:Joint Dislocations / Q000000981:diagnostic imaging* / Q000601:surgery; D008022:Ligaments / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D016896:Treatment Outcome