Vet Comp Orthop Traumatol 2021; 34(06): 375-385
DOI: 10.1055/s-0041-1731810
Original Research

A Retrospective Study of Postoperative Development of Implant-Induced Osteoporosis in Radial–Ulnar Fractures in Toy Breed Dogs Treated with Plate Fixation

1   Department of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
,
1   Department of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
,
1   Department of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
,
Hiroyuki Akagi
1   Department of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
,
Nobuo Kanno
1   Department of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
,
Shuji Suzuki
1   Department of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
,
Yasuji Harada
1   Department of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
,
Hiromitsu Orima
2   ORM Co, Saitama-shi, Saitama, Japan
,
Yasushi Hara
1   Department of Veterinary Surgery, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan
› Author Affiliations
Funding None.

Abstract

Objective This study aimed to evaluate implant-induced osteoporosis (IIO) development in toy breed dogs treated using internal fixation with digital radiographs as the index of pixel values.

Study Design There were 226 cases (236 limbs) of toy breed dogs with radial–ulnar fractures. Pixel values were measured on radiographs immediately, 2 weeks and 1 to 12 months after surgery. The ratio of pixel values (PVR) represented the bone mineral areal density based on the humeral condyle in the same image. The dogs were grouped based on the fixation methods, age and status of destabilization.

Results There was a significant decrease in the PVR at 1 to 12 months postoperatively for all cases. There were not any significant differences in PVR of antebrachial fractures between those repaired with plates using locking head screws, cortex screws or a combination of locking and cortex screws. Implant-induced osteoporosis persisted at 1 to 12 months postoperatively in dogs aged ≧6 months, while the PVR increased after 3 months in dogs aged <6 months. Based on the destabilization method, there was a significant increase in the PVR at 3 months in the plate removal group.

Conclusion This study suggests that IIO occurs in small dogs treated with plates and screws. Moreover, patients aged < 6 months showed an early postoperative recovery of bone mineral areal density. Further, screw and plate removal could contribute to the recovery of bone mineral areal density.

Authors' Contributions

All authors contributed to the conception of the study, study design and interpretation. All of them drafted and revised and approved the submitted manuscript.


Supplementary Material



Publication History

Received: 06 October 2020

Accepted: 08 June 2021

Article published online:
03 August 2021

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