Summary
Objectives: To report the use of compression resistant matrix (CRM) infused with recombinant
human bone morphogenetic protein (rhBMP-2) prospectively in the healing of non union
long-bone fractures in dogs.
Methods: A longitudinal cohort of dogs that were presented with nonunion fractures were classified
and treated with CRM soaked with rhBMP-2 and fracture fixation. They were followed
with serial radiographs and evaluated for healing times and complications according
to the time frame and definitions previously established for orthopaedic clinical
cases.
Results: Eleven nonunion fractures in nine dogs were included. Median healing time was 10
weeks (range: 7–20 weeks). Major perioperative complications due to bandage morbidity
were encountered in two of 11 limbs and resolved. All other complications were minor.
They occurred perioperatively in eight of 11 limbs. Minor follow-up complications
included short-term in one of two limbs, mid-term in one of three, and long-term in
four of five limbs. Nine limbs returned to full function and two limbs returned to
acceptable function at the last follow-up.
Clinical significance: Nonunion fractures given a poor prognosis via standard-of-care treatment were successfully
repaired using CRM with rhBMP-2 accompanying fixation. These dogs, previously at high
risk of failure, returned to full or acceptable function.
Keywords
Bone regeneration - bone morphogenetic protein 2 - BMP-2 - compression resistant matrix
- nonunion