Fracture-associated sarcoma in the dog

Area of Science:

• Veterinary Orthopedics
• Canine Oncology
• Biomaterials Science

Background:

• Fracture-associated sarcomas (FAS) are rare but aggressive tumors.
• Previous reports suggest a link between orthopedic implants and sarcoma development in dogs.
• Stainless steel plates and screws are commonly used for fracture stabilization in large-breed dogs.

Purpose of the Study:

• To investigate the occurrence and characteristics of sarcomas developing after stabilization of comminuted long bone fractures using stainless steel implants.
• To compare findings with previously reported cases of fracture-associated sarcomas.

Main Methods:

• Retrospective review of seven cases of large-breed dogs with fracture-associated sarcomas.
• Analysis of radiographic and histologic findings.
• Comparison with a historical cohort of 35 fracture-associated sarcomas.

Main Results:

• Seven sarcomas developed in dogs treated with stainless steel plates and screws for comminuted long bone fractures.
• Mean interval between fracture and tumor diagnosis was 5.5 years.
• Radiographic features included subperiosteal proliferation and soft tissue mineralization; cortical destruction was variable. Histologic subtypes of osteosarcoma were observed, with 5 dogs showing signs of chronic infection.

Conclusions:

• Stainless steel implants may contribute to the development of fracture-associated sarcomas in dogs.
• These tumors share similarities with previously reported FAS, regardless of fixation type.
• Femoral diaphyseal sarcomas were most common.