Karlin W Michael, Lirtzman Ross, Kowaleski Michael P
Department of Clinical Sciences, Cummings School of Veterinary Medicine at Tufts University, North Grafton, Massachusetts, United States.
Arizona Canine Orthopedics and Sports Medicine, Scottsdale, Arizona, United States.
Vet Comp Orthop Traumatol. 2025 Jul 22. doi: 10.1055/a-2651-6297.
The purpose of this study was to compare the calculated angle of lateral opening (ALO) and open-face version obtained using an acetabular cup position assessment device (CPAD) to the known ALO and open-face version of an acetabular component. The null hypothesis was that there would be no significant differences between the ALO and open-face versions using the CPAD compared with the known values.Radiographic images simulating a sagittal plane pelvis were obtained with a BFX™ acetabular component containing a CPAD mounted on a plexiglass jig with a dual-plane inclinometer. Images were obtained at an open-face version of 0 degrees with ALO at 30, 40, 45, 50, and 60 degrees, repeated in triplicate, and were randomized. Measurements of the CPAD bars were used to calculate the open-face version, and ALO measurements were compared using a paired -test with a -value set at < 0.05. Agreement was assessed with a Lin's Concordance Correlation Coefficient.The calculated ALO was not significantly different from the known ALO ( = 0.608) and showed near-perfect correlation of the ALO with a Lin's Concordance Correlation Coefficient ( value) of 0.994. The calculated open-face version was significantly different from the known version.The results demonstrate that the CPAD is an accurate method to determine ALO in a simulated sagittal plane pelvis radiographic view.
本研究的目的是将使用髋臼杯位置评估装置（CPAD）获得的外侧开口角度（ALO）和开口面版本的计算值与髋臼组件已知的ALO和开口面版本进行比较。无效假设是，与已知值相比，使用CPAD测量的ALO和开口面版本之间不会有显著差异。使用安装在带有双平面倾角仪的有机玻璃夹具上、含有CPAD的BFX™髋臼组件获取模拟矢状面骨盆的X线图像。在开口面版本为0°且ALO分别为30°、40°、45°、50°和60°的情况下获取图像，重复三次并随机排列。使用CPAD杆的测量值来计算开口面版本，并使用配对检验比较ALO测量值，设定P值<0.05。使用林氏一致性相关系数评估一致性。计算得到的ALO与已知的ALO无显著差异（P = 0.608），并且ALO显示出与林氏一致性相关系数（r值）为0.994的近乎完美的相关性。计算得到的开口面版本与已知版本有显著差异。结果表明，在模拟矢状面骨盆X线视图中，CPAD是确定ALO的准确方法。
