Henninger W, Köppel E
Universitätsklinik für Röntgenologie, Veterinärmedizinischen Universität Wien.
Tierarztl Prax. 1994 Jun;22(3):278-85.
The weight-bearing part of the canine hip is its dorsocraniolateral portion. On the radiograph the configuration of the craniolateral acetabular rim is important for evaluation of hip dysplasia. Changes in formation of this area should be differentiated from artefacts due to malpositioning. When the pelvis is tilted dorsally, the cranial acetabular rim is superimposed on the cranioventral acetabular contour and the acetabular roof. The craniolateral contour then seems to be missing. The contours of a ventrally tilted pelvis do not overlap, but it is difficult to discern the craniolateral rim. The reference points for Norberg-Olsson's measurements are difficult to choose in both cases and the angles may vary up to 10 degrees. A symmetrically positioned pelvis shows one point of reference for Norberg-Olsson's measurement where the cranial acetabular contour, the cranioventral margin and the acetabular roof intersect. Therefore poor positioning of the pelvis for radiographic evaluation of hip dysplasia should be avoided when using Norberg-Olsson's measurements.
犬髋关节的负重部分是其背外侧颅侧部分。在X线片上，颅侧髋臼缘的形态对于评估髋关节发育不良很重要。该区域形态的变化应与因体位不当造成的伪影相区分。当骨盆背倾时，髋臼颅侧缘会与髋臼颅腹侧轮廓及髋臼顶重叠。此时颅外侧轮廓似乎消失。骨盆腹倾时轮廓不会重叠，但很难辨别颅外侧缘。在这两种情况下，诺伯格-奥尔森测量的参考点都很难选取，角度变化可能高达10度。对称摆放的骨盆为诺伯格-奥尔森测量提供了一个参考点，即髋臼颅侧轮廓、颅腹侧边缘与髋臼顶的交点。因此，在使用诺伯格-奥尔森测量法对髋关节发育不良进行X线评估时，应避免骨盆摆放不当。
