Influence of fixation systems on complications after tibial plateau leveling osteotomy in dogs greater than 45.4 kilograms (100 lb)

Vet Surg. 2019 May;48(4):505-512. doi: 10.1111/vsu.13151. Epub 2019 Jan 6.


Objective: To determine the influence of 3 fixation systems on complications rate after tibial plateau leveling osteotomy (TPLO) in dogs >45.4 kg.

Study design: Retrospective case series.

Sample population: Dogs (N = 287, 342 stifles) >45.4 kg with cranial cruciate ligament tear treated with TPLO.

Methods: The medical records of dogs treated with TPLO were reviewed for fixation and postoperative complications, with a follow-up of at least 6 weeks. A random effects logistic regression model was used to evaluate the association between the type of TPLO fixation system and complications.

Results: The fixation systems included a 3.5-mm broad TPLO plate alone (8P; 78.4%), a 3.5-mm broad TPLO plate with SOP (String of Pearls) plate (8AP; 14.9%), and a 3.5-mm standard TPLO plate (6P; 6.7%). Among the included stifles, 214 (62.6%) fixation systems were classified as locking, and 128 (37.4%) were classified as nonlocking. The fixation system was predictive of complications. The 8P had the lowest odds ratio for complication among the 3 fixation systems. Odds of developing complications were higher with the 8AP fixation system than with the 8P fixation system. Locking fixation eliminated the association between weight and complication rate.

Conclusion: Fixation of a TPLO with the 8AP increased the risk of complications compared with the 8P in this population of large dogs.

Clinical significance: Locking fixation of TPLO with a 3.5-mm broad TPLO plate alone should be considered in large dogs because it may reduce complications.

MeSH terms

  • Animals
  • Anterior Cruciate Ligament / surgery*
  • Anterior Cruciate Ligament Injuries / surgery
  • Anterior Cruciate Ligament Injuries / veterinary*
  • Bone Plates / adverse effects
  • Bone Plates / veterinary*
  • Dog Diseases / surgery*
  • Dogs
  • Female
  • Logistic Models
  • Male
  • Osteotomy / instrumentation
  • Osteotomy / methods
  • Osteotomy / veterinary*
  • Postoperative Complications / veterinary
  • Retrospective Studies
  • Stifle / surgery
  • Tibia / surgery