Clinical Outcomes of Open Fracture Reduction Using the Micro Series Fixin-Intrauma Locking Plate System in Small Breed Dogs

Introduction: Radius and ulna (RU) fractures in small breed dogs have an increased risk of nonunion or delayed union due to decreased vasculature and soft tissues of the distal radius. The Fixin-Intrauma Micro Series utilizes a bushing and screwhead interface via a conical locking mechanism that allows for a thinner plate design. We hypothesize that the Fixin-Intrauma 1.3 to 1.7 mm Micro Series provides a good functional outcome in small breed dogs.

Materials and Methods: Medical records were reviewed from 2019 to 2023 of 25 RU fractures that were repaired using 1.3 to 1.7 mm Fixin-Intrauma plates. Clinical outcomes were evaluated using records and radiographs from the teaching hospital and referring veterinarians.

Results: Minor complications occurred in 36.84% (n = 7) limbs and included bandage sores (n = 1), acral lick dermatitis (n = 2), screw-associated radiolucency (n = 1), and implant-associated osteopenia (n = 3). Major complications occurred in 9.52% of limbs (n = 2). Long-term outcomes were assessed at a mean of 54.5 weeks (4 weeks–4 years), with 90.47% (n = 19) dogs showing no lameness, and 9.52% (n = 2) minor intermittent lameness and 0% (n = 0) poor return to function. Screw penetration of the ulna was noted in 28.57% of limbs (n = 6) and they were 3.6 times more likely to develop lameness (CI 95%).

Discussion/Conclusion: We accept the hypothesis that the 1.3 to 1.7 mm Fixin-Intrauma Micro Series provides a good functional outcome in small breed dogs. Ulnar screw penetration was associated with a greater risk of developing lameness. Due to the small sample size further evaluation of Fixin-Intrauma plates for RU fractures should be considered.

Acknowledgment

None.

Publication History

Article published online:
15 July 2025