Atlantooccipital overlapping and its effect on outcomes after ventral fixation in dogs with atlantoaxial instability

Fumitaka TAKAHASHI; Takaharu HAKOZAKI; Shigenori KOUNO; Shuji SUZUKI; Asaka SATO; Nobuo KANNO; Yasuji HARADA; Shinya YAMAGUCHI; Yasushi HARA

doi:10.1292/jvms.17-0438

Surgery

Atlantooccipital overlapping and its effect on outcomes after ventral fixation in dogs with atlantoaxial instability

Fumitaka TAKAHASHI, Takaharu HAKOZAKI, Shigenori KOUNO, Shuji SUZUKI, Asaka SATO, Nobuo KANNO, Yasuji HARADA, Shinya YAMAGUCHI, Yasushi HARA

Author information

Fumitaka TAKAHASHI
The Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, 1-7-1 Kyonan, Musashino-shi, Tokyo 180-0023, Japan
YPC Tokyo Animal Orthopedic Surgery Hospital, 7-1-13 Oojima, Koutou-ku, Tokyo 136-0072, Japan
Takaharu HAKOZAKI
The Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, 1-7-1 Kyonan, Musashino-shi, Tokyo 180-0023, Japan
Shigenori KOUNO
The Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, 1-7-1 Kyonan, Musashino-shi, Tokyo 180-0023, Japan
Shuji SUZUKI
The Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, 1-7-1 Kyonan, Musashino-shi, Tokyo 180-0023, Japan
Asaka SATO
Azabu University Veterinary Teaching Hospital, 1-17-71 Fuchinobe, Chuou-ku, Sagamihara-shi, Kanagawa 252-5201, Japan
Nobuo KANNO
The Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, 1-7-1 Kyonan, Musashino-shi, Tokyo 180-0023, Japan
Yasuji HARADA
The Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, 1-7-1 Kyonan, Musashino-shi, Tokyo 180-0023, Japan
Shinya YAMAGUCHI
The Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, 1-7-1 Kyonan, Musashino-shi, Tokyo 180-0023, Japan
YPC Tokyo Animal Orthopedic Surgery Hospital, 7-1-13 Oojima, Koutou-ku, Tokyo 136-0072, Japan
Yasushi HARA
The Laboratory of Veterinary Surgery, Nippon Veterinary and Life Science University, 1-7-1 Kyonan, Musashino-shi, Tokyo 180-0023, Japan

Keywords: atlantoaxial instability (AAI), atlantooccipital overlapping (AOO), surgical outcome, ventral fixation

JOURNAL FREE ACCESS

2018 Volume 80 Issue 3 Pages 526-531

DOI https://doi.org/10.1292/jvms.17-0438

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Abstract

We compared clinical outcomes after ventral fixation in dogs with atlantoaxial instability (AAI) on the basis of the presence or absence of atlantooccipital overlapping (AOO). Of 41 dogs diagnosed with AAI and treated ventral fixation, 12 exhibited AOO (AOO group), whereas 29 did not (non-AOO group). The AOO group had significantly higher neurological scores before (P=0.024) and 1 month after (P=0.033) surgery compared with the non-AOO group; however, no significant differences were observed between the groups 2 months after surgery. The presence of complicating AOO affected the clinical signs for dogs with AAI, but did not directly affect the outcome of surgical stabilization of AAI.

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