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  • Title: Ultrasonographic investigation of the atlanto-occipital articulation in the horse.
    Author: Gollob E, Edinger H, Stanek C, Wurnig C.
    Journal: Equine Vet J; 2002 Jan; 34(1):44-50. PubMed ID: 11817551.
    Abstract:
    The purpose of this study was to evaluate ultrasonographic imaging as a means of easy and noninvasive diagnosis of articular and periarticular structures of the atlanto-occipital articulation in the horse; and to find a safe approach to the atlanto-occipital joint. Ultrasonographic investigations were performed on 6 healthy horses and 16 specimens from horses humanely destroyed age 2-17 years (mean 9.56 years). Preliminary examinations included anatomical studies and preparation of cross-sections. On 4 horse specimens, puncture of the atlanto-occipital joint under ultrasonographic guidance was performed and a new lateral approach undertaken. For ultrasonographic investigations, the neck was divided into 4 zones according to anatomical and clinical modalities: 1) insertion of the funiculus nuchae; 2) tuberculum dorsale of the atlas; 3) atlanto-occipital joint and 4) region above the foramen alare. Each zone was examined in transverse and longitudinal planes proceeding from cranial to caudal. Ultrasonography was found to be useful for soft tissue imaging of this region and was performed down to the atlanto-occipital joint of which the joint surfaces, joint capsule and collateral ligament could be delineated in both planes. We conclude that ultrasonography of the neck is a useful technique, representing an easy to use and safe method. However, further studies are indicated which should be performed on live subjects.
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