Martins João, Colaço Bruno J, Ferreira António J, Ginja Mário M
João MC Martins, DVM, MVS, Centre for Research and Technology of Agro-Environment and Biological Sciences, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal, Phone: + 351 962693208, E-mail:
Vet Comp Orthop Traumatol. 2016;29(1):68-74. doi: 10.3415/VCOT-15-02-0025. Epub 2015 Nov 9.
To study the symmetry of the iliac horizontal diameter (IHD) maximum obturator foramen width (OFW), ischiatic femoral overlap (IFO), pelvic horizontal radius (PHR), femoral head diameter (FHD), and obturator foramen area (OFA) parameters in the normal hip extended radiographic view and to evaluate the correlation of pelvic rotation with the magnitude of asymmetry of these parameters.
Nine canine cadavers from adult, large and giant breeds were radiographed in standard hip extended views and with 2°, 4° and 6° degrees of rotation. The variables IHD, OFW, IFO, PHR, FHD, and OFA were analysed in radiographs.
The IHD measurements exhibited repeatability, bilateral symmetry and 95% of confidence interval of asymmetry in different pelvic rotations without superposition (p <0.05); OFW and IFO exhibited repeatability, bilateral symmetry and a small superposition in 95% of confidence interval of asymmetry according different pelvic rotations; PHR, FHD and OFA exhibited repeatability, bilateral symmetry and unacceptable superposition in 95% of confidence interval of asymmetry depending on pelvic rotation.
The IHD is the recommended variable and OFW is an acceptable variable in order to evaluate slight pelvic rotation. The data may be used in qualitative analyses of hip extended radiographic views. In the future, complementary studies should be performed to evaluate the impact of degree of pelvic rotation on the hip dysplasia score.
研究正常髋关节伸展位X线片上髂骨水平直径（IHD）、最大闭孔宽度（OFW）、坐骨股骨重叠（IFO）、骨盆水平半径（PHR）、股骨头直径（FHD）和闭孔面积（OFA）参数的对称性，并评估骨盆旋转与这些参数不对称程度的相关性。
对9只成年大型和巨型犬种的尸体进行标准髋关节伸展位及2°、4°和6°旋转位的X线摄影。对X线片中的IHD、OFW、IFO、PHR、FHD和OFA变量进行分析。
IHD测量值在不同骨盆旋转且无重叠时具有可重复性、双侧对称性以及95%不对称置信区间（p<0.05）；OFW和IFO在不同骨盆旋转时具有可重复性、双侧对称性，且在95%不对称置信区间中有少量重叠；PHR、FHD和OFA在不同骨盆旋转时具有可重复性、双侧对称性，但在95%不对称置信区间中有不可接受的重叠。
IHD是评估轻微骨盆旋转的推荐变量，OFW是可接受变量。这些数据可用于髋关节伸展位X线片的定性分析。未来，应开展补充研究以评估骨盆旋转程度对髋关节发育不良评分的影响。
