Effect of hyperbaric oxygen treatment on incorporation of an autogenous cancellous bone graft in a nonunion diaphyseal ulnar defect in cats.
OBJECTIVE
To determine whether hyperbaric oxygen treatment (HBOT) would affect incorporation of an autogenous cancellous bone graft in diaphyseal ulnar defects in cats.


METHODS
12 mature cats.


METHODS
Bilateral nonunion diaphyseal ulnar defects were created in each cat. An autogenous cancellous bone graft was implanted in 1 ulnar defect in each cat, with the contralateral ulnar defect serving as a nongrafted specimen. Six cats were treated by use of hyperbaric oxygen at 2 atmospheres absolute for 90 minutes once daily for 14 days, and 6 cats were not treated (control group). Bone labeling was performed, using fluorochrome markers. Cats were euthanatized 5 weeks after implanting, and barium sulfate was infused to evaluate vascularization of grafts. Ulnas were evaluated by use of radiography, microangiography, histologic examination, and histomorphometric examination.


RESULTS
Radiographic scores did not differ between treatment groups. Microangiographic appearance of grafted defects was similar between groups, with all having adequate vascularization. Differences were not observed between treated and nontreated groups in the overall histologic appearance of decalcified samples of tissue in grafted defects. Mean distance between fluorescent labels was significantly greater in cats given HBOT than in nontreated cats. Median percentage of bone formation in grafted defects was significantly greater in cats given HBOT.


CONCLUSIONS
Hyperbaric oxygen treatment increased the distance between fluorescent labels and percentage of bone formation when incorporating autogenous cancellous bone grafts in induced nonunion diaphyseal ulnar defects in cats, but HBOT did not affect revascularization, radiographic appearance, or qualitative histologic appearance of the grafts.
Kerwin
S C
SC
Department of Veterinary Clinical Science, School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803, USA.
Lewis
D D
DD
Elkins
A D
AD
Oliver
J L
JL
Hosgood
G
G
Pechman
R D
RD
Dial
S L
SL
Strain
G M
GM
D000818:Animals; D001466:Barium Sulfate / Q000737:chemistry; D016025:Bone Transplantation / Q000379:methods / Q000662:veterinary*; D002415:Cats / Q000293:injuries / Q000601:surgery*; D005452:Fluoresceins / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry; D017102:Fracture Healing / Q000187:drug effects*; D005599:Fractures, Ununited / Q000601:surgery / Q000662:veterinary*; D006651:Histocytochemistry; D006931:Hyperbaric Oxygenation / Q000662:veterinary*; D007091:Image Processing, Computer-Assisted; D008856:Microscopy, Fluorescence / Q000662:veterinary; D010118:Oxytetracycline / Q000737:chemistry; D011859:Radiography; D011897:Random Allocation; D018709:Statistics, Nonparametric; D014458:Ulna Fractures / Q000000981:diagnostic imaging / Q000188:drug therapy / Q000601:surgery / Q000662:veterinary*
D005452:Fluoresceins; D005456:Fluorescent Dyes; C083098:calcein green; D001466:Barium Sulfate; D010118:Oxytetracycline