title: Functional and radiographic results of patients with syndesmotic screw fixation: implications for screw removal.
abstract: OBJECTIVE
  Screw fixation of the injured syndesmosis restores stability but may reduce motion. The purpose of this study is to determine whether functional outcomes and radiographic results after ankle fracture are affected by the status of the syndesmosis screw.
  
  
  METHODS
  Retrospective review of a consecutive clinical series.
  
  
  METHODS
  Level 1 academic trauma center.
  
  
  METHODS
  One hundred six adults were reviewed radiographically; mean follow up was 15 months (range, 4-30 months). Seventy-six of the 106 patients completed formal functional testing; mean follow up was 23 +/- 13 months (range, 12-32 months).
  
  
  METHODS
  Open reduction and internal fixation, including fixation of the tibiofibular syndesmosis.
  
  
  METHODS
  Patients with intact, broken or loose, or removed syndesmosis screws were compared. Functional outcomes were measured using the Lower Extremity Measure and the Olerud Molander ankle score. Radiologic review included tibiofibular clear space, tibiofibular overlap, and medial clear space.
  
  
  RESULTS
  Functional outcomes were improved in patients with fractured, loosened, or removed screws compared with those with intact screws. The Lower Extremity Measure score for patients with intact screws was 70 +/- 6 compared with 85 +/- 3 for fractured, loosened, or removed screws (P = 0.01). The Olerud Molander ankle score for patients with intact screws was 47 +/- 8.0 compared with 64 +/- 4 for fractured, loosened, or removed screws (P = 0.04). There was no difference in outcome comparing fractured, loosened, and removed screws. The tibiofibular clear space was narrowed in patients with intact screws compared with removed, fractured, or loose screws. The tibiofibular clear space for intact screws was 3.1 +/- 0.2 compared with 4.1 +/- 0.2 for removed, fractured, or loosened screws (P = 0.005). There was no difference in outcome comparing large and small fragment screws.
  
  
  CONCLUSIONS
  An intact syndesmosis screw was associated with a worse functional outcome compared with loose, fractured, or removed screws. However, there were no differences in functional outcomes comparing loose or fractured screws with removed screws. Screw removal is unlikely to benefit patients with loose or fractured screws but may be indicated in patients with intact syndesmosis screws.
authors.affiliation: Orthopedic Surgery, Victoria Hospital, University of Western Ontario, London, Ontario, Canada.
authors.forename: Ajay
authors.initials: A
authors.lastname: Manjoo
authors.forename: David W
authors.initials: DW
authors.lastname: Sanders
authors.forename: Christina
authors.initials: C
authors.lastname: Tieszer
authors.forename: Mark D
authors.initials: MD
authors.lastname: MacLeod
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016512:Ankle Injuries / Q000000981:diagnostic imaging* / Q000601:surgery*; D001863:Bone Screws; D020878:Device Removal; D005260:Female; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D050723:Fractures, Bone / Q000000981:diagnostic imaging* / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D011859:Radiography; D020127:Recovery of Function; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult