title: Implant-associated neoplasia in dogs: 16 cases (1983-2013).
abstract: OBJECTIVE
  To characterize clinical and pathological features of implant-associated neoplasms in dogs.
  
  
  METHODS
  Retrospective case-control study.
  
  
  METHODS
  16 dogs with implant-associated neoplasia and 32 control dogs with osteosarcoma without implants. Procedures: Medical records of dogs with tumors associated with metallic implants (cases) treated between 1983 and 2013 were reviewed. Two dogs with naturally occurring osteosarcoma (controls) were matched to each case on the basis of tumor location, age, and sex.
  
  
  RESULTS
  Median time from implant placement to diagnosis of neoplasia was 5.5 years (range, 9 months to 10 years). Pelvic limbs were most frequently affected, including the tibia (8/16) and femur (5/16), with 1 neoplasm involving both the femur and pelvis. Implant: associated tumors most commonly affected the diaphysis (15/16), with osteosarcomas significantly more likely to involve the long bone diaphysis in case dogs than in control dogs with naturally occurring osteosarcomas. Osteosarcoma was the most common tumor, accounting for 13 of 16 implant-associated tumors. For 7 of these osteosarcoma cases, review of histopathology results enabled subclassification into osteoblastic nonproductive (n = 3), chondroblastic (2), osteoblastic productive (1), and fibroblastic (1) groups. Three case dogs had a diagnosis of histiocytic sarcoma, fibrosarcoma, and spindle cell sarcoma.
  
  
  CONCLUSIONS
  Results of this study highlighted important anatomic differences between spontaneous and implant-associated neoplasia in dogs.
authors.forename: Andrew G
authors.initials: AG
authors.lastname: Burton
authors.forename: Eric G
authors.initials: EG
authors.lastname: Johnson
authors.forename: William
authors.initials: W
authors.lastname: Vernau
authors.forename: Brian G
authors.initials: BG
authors.lastname: Murphy
mesh_terms: D000818:Animals; D016022:Case-Control Studies; D004283:Dog Diseases / Q000209:etiology* / Q000473:pathology; D004285:Dogs; D005260:Female; D008297:Male; D009369:Neoplasms / Q000209:etiology / Q000473:pathology / Q000662:veterinary*; D019736:Prostheses and Implants / Q000009:adverse effects / Q000662:veterinary*; D012189:Retrospective Studies