title: Effect of a locking triple pelvic osteotomy plate on screw loosening in 26 dogs.
abstract: OBJECTIVE
  To evaluate the complication rate of the double (DPO) and triple pelvic osteotomy (TPO) procedure (unilateral and bilateral) with a locking purpose-specific plate.
  
  
  METHODS
  Retrospective case series
  
  
  METHODS
  Dogs (n = 26; 38 hips)
  
  
  METHODS
  Medical records (January 2007-January 2011) of dogs that had unilateral or bilateral DPO or TPO were evaluated. Signalment, age, body weight, estimated preoperative subluxation and reduction angles, lameness, and complications were evaluated. Follow-up radiographs were evaluated for implant loosening or failure, femoral head coverage (FCH), pelvic dimensions, and radiographic evidence of healing.
  
  
  RESULTS
  Screw loosening occurred in 1 of 266 (0.4%) screws placed and in 1 of 38 hips (2.6%). The rate of screw loosening was significantly lower than previously reported. Only 1 hip (2.6%) developed a major complication. Minor complications involving implants occurred in 2 hips (5.3%). Three to 5 locking screws were used per plate. There was a significant increase in FCH and Norberg angle (NA) compared with preoperative values. No clinically significant change in pelvic canal dimensions measured at 3 locations was identified.
  
  
  CONCLUSIONS
  Locking 7-hole TPO plates with 3-5 locking screws resulted in a lower rate of major and minor implant associated complications than the reported complication rate for conventional 6-hole plates. En bloc pullout of the caudal aspect of the plate is an infrequent but repeatable complication associated with the locking TPO implant.
authors.affiliation: Affiliated Veterinary Specialists, Maitland, FL, USA. drrose@uga.edu
authors.forename: Scott A
authors.initials: SA
authors.lastname: Rose
authors.forename: Jeffrey N
authors.initials: JN
authors.lastname: Peck
authors.forename: Cheryl A
authors.initials: CA
authors.lastname: Tano
authors.forename: Nizam
authors.initials: N
authors.lastname: Uddin
authors.forename: Jacek J
authors.initials: JJ
authors.lastname: de Haan
mesh_terms: D000818:Animals; D001860:Bone Plates / Q000662:veterinary*; D001863:Bone Screws / Q000662:veterinary*; D004285:Dogs; D005260:Female; D006619:Hip Dysplasia, Canine / Q000601:surgery; D008297:Male; D010027:Osteotomy / Q000295:instrumentation / Q000662:veterinary*; D010384:Pelvic Bones / Q000601:surgery; D011183:Postoperative Complications / Q000662:veterinary*; D012189:Retrospective Studies