ZusammenfassungIm Rahmen einer retrospektiven Studie wurden seitliche Röntgenaufnahmen der Halswirbelsäule (HWS) von Pferden, die als Leit-oder Begleitsymptom eine Ataxie aufwiesen, auf arthrotische Veränderungen hin untersucht. Ziel der Arbeit war die Objektivierung der Rönt-gendiagnostik an der arthrotisch veränderten Halswirbelsäule des Pferdes. Es wird eine Messmethode vorgestellt, mit der man auf lateralen Röntgenaufnahmen der HWS die Größe eines Wirbels bestimmen kann. Radiographic measurements of the equine cervical spine with arthrotic alterations -a retrospective statistical study During this retrospective study, lateral radiographs of the cervical spine from horses showing ataxia as single or main symptom were examined for arthrotic lesions. The goal of this study was to objectify radiographic diagnosis of arthrosis in the horses cervical spine. A method is being introduced, by which the size of a vertebrae on a lateral radiograph can be determined. On each vertebrae five (5) lengths were measured. The height and width of the processus articularis cranialis, the height and width of the vertebrae and also the height of the foramen intervertebrale. Using these parameters, radiographs of 69 horses with and 36 horses without arthrotic lesions of the cervical spine were evaluated and compared. Statistical analysis was performed and showed, that horses with arthrotic changes of the cervical spine had significantly larger processus articulares craniales than horse without. These processus in changed joints were on an average 22% smaller concerning the sixth and 32% smaller concerning the seventh cervical vertebrae. The length of the seventh cervical vertebrae in horses younger than three years showing arthrotic changes of the cervical spine was on an average 7 mm shorter than the one of sound horses. Predilection site for arthrotic changes of the cervical spine in horse is the sixth and the seventh vertebrae.