title: Screw Loosening and Pelvic Canal Narrowing After Lateral Plating of Feline Ilial Fractures With Locking and Nonlocking Plates.
abstract: OBJECTIVE
  To compare the frequency of complications, including screw loosening and pelvic canal narrowing, associated with dynamic compression plating, locking plating, and double locking plating of ilial fractures in cats.
  
  
  METHODS
  Historical cohort study.
  
  
  METHODS
  The radiographs and medical records of cats with pelvic fractures that were presented between 2004 and 2013 were reviewed. The cases were categorized based on the plate type and number as dynamic compression plate (DCP), single locking plate (LPS) and double locking plates (dLPS). The frequency of screw loosening was compared across categories using a Fisher's exact test. The change in pelvic alignment, described by the change in sacral index (postoperative sacral index-followup sacral index), was compared across plate categories using ANOVA.
  
  
  RESULTS
  The frequency of screw loosening for DCP (5/10) was significantly higher than LPS (1/13) and dLPS (0/11) (P = .05, P = .012, respectively). There was no significant difference in the SI change across plate categories. The mean change in sacral index for DCP was -0.11 (95%CI -0.25 to 0.03), for LPS was 0.0007 (95%CI -0.07 to 0.08), and for dLPS was -0.01 (95%CI -0.04 to 0.02). None of the cats showed constipation postoperatively.
  
  
  CONCLUSIONS
  Screw loosening occurred less often but the change in pelvic canal alignment was not significantly different in ilial fractures repaired with LPS or dLPS compared to ilial fractures repaired with DCP. Locking plating of ilial fractures in cats may offer advantages compared to nonlocking plating.
authors.affiliation: Clinic for Small Animal Surgery, Vetsuisse Faculty University of Zurich, Zurich, Switzerland.
authors.forename: Philipp A
authors.initials: PA
authors.lastname: Schmierer
authors.affiliation: Division of Diagnostic Imaging, Vetsuisse Faculty University of Zurich, Zurich, Switzerland.
authors.forename: Patrick R
authors.initials: PR
authors.lastname: Kircher
authors.affiliation: Division of Epidemiology, Vetsuisse Faculty University of Zurich, Zurich, Switzerland.
authors.forename: Sonja
authors.initials: S
authors.lastname: Hartnack
authors.affiliation: Clinic for Small Animal Surgery, Vetsuisse Faculty University of Zurich, Zurich, Switzerland.
authors.forename: Sebastian C
authors.initials: SC
authors.lastname: Knell
mesh_terms: D000818:Animals; D001860:Bone Plates / Q000009:adverse effects / Q000662:veterinary*; D001863:Bone Screws / Q000009:adverse effects / Q000662:veterinary*; D002415:Cats / Q000293:injuries / Q000601:surgery*; D015331:Cohort Studies; D005260:Female; D050723:Fractures, Bone / Q000601:surgery / Q000628:therapy / Q000662:veterinary*; D007085:Ilium / Q000293:injuries*; D008297:Male; D010388:Pelvis / Q000033:anatomy & histology / Q000098:blood supply; D012189:Retrospective Studies