title: Arthroscopic treatment of acute acromioclavicular dislocations using a double button device: Clinical and MRI results.
abstract: BACKGROUND
  Arthroscopic treatment of acute grade 3 and 4 acromioclavicular dislocation is controversial, due to the risk of recurrence and of postoperative reduction defect. The purpose of the present study was to investigate whether the healing of the acromioclavicular (AC) and coracoclavicular (CC) ligaments and the accurate 3D positioning parameters of the AC joint using MRI were correlated with satisfactory functional outcome.
  
  
  METHODS
  Thirty-nine patients were enrolled from 2009 to 2011 and managed arthroscopically by CC lacing using a double-button device.
  
  
  METHODS
  Clinical assessment included the Shoulder and Hand (QuickDash) score, Constant-Murley score and visual analog scale (VAS) for residual pain. Time and rate to return to work and return to sport were assessed according to type of sport and work. Postoperative complications were recorded. Radiological examination consisted of anteroposterior clavicle and lateral axillary radiographs. AC ligament healing and 3D joint congruency were assessed on MRI and correlated to the clinical results.
  
  
  RESULTS
  Mean patient age was 35.7 years (range, 20-55). Mean follow-up was 42.3±10.6 months (range, 24-60). At final follow-up, mean QuickDash score, Constant score and VAS were respectively 1.7±4 (range, 0-11), 94.7±7.3 (range, 82-100) and 0.5±1.4 (range, 0-2). Thirty-five (90%) patients were able to resume work, including heavy manual labor, and sport. Radiology found accurate 3D joint congruency in 34 patients (87%) and CC and AC ligament healing in 36 (93%). Complications included reduction loss at 6 weeks in 3 patients, requiring surgical stabilization. Satisfactory functional results were associated with accurate AC joint congruency in the coronal and axial planes (P<0.05) and good AC and CC ligament healing (P<0.04). An initial 25% reduction defect in the coronal plane was not associated with poor functional results (P=0.07).
  
  
  CONCLUSIONS
  Arthroscopic treatment by CC lacing satisfactorily restored ligament and joint anatomy in the present series. These satisfactory anatomic results correlated with good clinical outcome encourage continuing with this technique.
  
  
  METHODS
  Level IV, therapeutic case series.
authors.affiliation: Service de chirurgie orthopédique et de traumatologie, hôpital de la Pitié-Salpêtrière, université Pierre-et-Marie-Curie, 47, boulevard de l'Hôpital, 75013 Paris, France; Institut de chirurgie orthopédique, clinique des Lilas, 41-49, avenue du Maréchal-Juin, 93260 Les Lilas, France. Electronic address: philippeloriaut@hotmail.com.
authors.forename: P
authors.initials: P
authors.lastname: Loriaut
authors.affiliation: Service de chirurgie orthopédique et de traumatologie, hôpital de la Pitié-Salpêtrière, université Pierre-et-Marie-Curie, 47, boulevard de l'Hôpital, 75013 Paris, France.
authors.forename: L
authors.initials: L
authors.lastname: Casabianca
authors.affiliation: Service de chirurgie orthopédique et de traumatologie, hôpitaux universitaires Paris Nord - Val-de-Seine, 46, rue Henri-Huchard, 75877 Paris cedex 18, France.
authors.forename: J
authors.initials: J
authors.lastname: Alkhaili
authors.affiliation: Service de radiologie, clinique du sport, Bordeaux-Mérignac, 2, rue Negrevergne, 33700 Mérignac, France; Service de radiologie, hôpital Pellegrin, Bordeaux, place Amélie-Raba-Léon, 33076 Bordeaux, France.
authors.forename: B
authors.initials: B
authors.lastname: Dallaudière
authors.affiliation: Service de radiologie, hôpitaux universitaires Paris Nord - Val-de-Seine, 46, rue Henri-Huchard, 75877 Paris cedex 18, France.
authors.forename: E
authors.initials: E
authors.lastname: Desportes
authors.affiliation: Service de chirurgie orthopédique et de traumatologie, hôpital de la Pitié-Salpêtrière, université Pierre-et-Marie-Curie, 47, boulevard de l'Hôpital, 75013 Paris, France.
authors.forename: R
authors.initials: R
authors.lastname: Rousseau
authors.affiliation: Service de chirurgie orthopédique et de traumatologie, hôpitaux universitaires Paris Nord - Val-de-Seine, 46, rue Henri-Huchard, 75877 Paris cedex 18, France.
authors.forename: P
authors.initials: P
authors.lastname: Massin
authors.affiliation: Service de chirurgie orthopédique et de traumatologie, hôpitaux universitaires Paris Nord - Val-de-Seine, 46, rue Henri-Huchard, 75877 Paris cedex 18, France.
authors.forename: P
authors.initials: P
authors.lastname: Boyer
mesh_terms: D000173:Acromioclavicular Joint / Q000293:injuries / Q000503:physiopathology / Q000601:surgery*; D000328:Adult; D001182:Arthroscopy / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods; D002968:Clavicle / Q000000981:diagnostic imaging / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D004204:Joint Dislocations / Q000150:complications / Q000601:surgery*; D008023:Ligaments, Articular / Q000502:physiology* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000209:etiology; D010147:Pain Measurement; D011183:Postoperative Complications / Q000000981:diagnostic imaging; D011859:Radiography; D012008:Recurrence; D000068958:Return to Sport; D062707:Return to Work; D012782:Shoulder / Q000000981:diagnostic imaging; D012783:Shoulder Dislocation / Q000601:surgery; D013898:Thoracic Injuries; D014945:Wound Healing; D055815:Young Adult
keywords: Acromioclavicular joint dislocation; Arthroscopy; Ligament healing; MRI; Shoulder surgery