OBJECTIVE  Patellar luxation can be associated with abnormal proximodistal positioning of the patella. The current gold standard index (Insall-Salvati) for referencing this position is poorly suited to postoperative use, if the tibial tuberosity is moved surgically, but has the advantage of changing minimally with altered joint angles. The aim of this study was to identify an alternative index, which was simple to use, joint-angle insensitive and suitable for postoperative use. STUDY DESIGN  Candidate indices based on the angle between stifle joint landmarks were screened across a wide range of joint angles for insensitivity to joint angle changes using vulpine and canine stifle radiographs. Intraobserver and interobserver agreements were assessed for a single candidate index using canine radiographs. RESULTS  An angular index based on the caudal aspect of the femoral and tibial condyles and the apex of the patella was largely insensitive to joint angle variation. Intra- and interobserver agreements appeared suitable for clinical use, with low within-subject standard deviations (<1.3°) and coefficients of variations (<2.2%), and high intraclass correlation coefficients (>0.89). CONCLUSION  Patellar proximodistal position can be acceptably assessed at a variety of caudal joint angles using the described angular index. Further work is required to define reference intervals across a range of canine breeds.

中文翻译：

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关节角敏感度有限的of骨近端定位的测量。

目的Pat骨脱位可能与abnormal骨近端近端定位异常有关。如果通过手术移动胫骨结节，则当前用于此位置的金标准指数（Insall-Salvati）不太适合术后使用，但具有随关节角度变化而最小变化的优点。这项研究的目的是确定一种替代指数，该指数易于使用，对关节角不敏感并且适合术后使用。研究设计使用Vulpine和犬用Stifle射线照相技术，在广泛的关节角范围内筛选了基于窒息性关节界标之间的角度的候选指标，以防止对关节角度的变化不敏感。使用犬X光片对单个候选索引评估了观察者内和观察者间协议。结果基于股骨和胫骨con的尾端和and骨顶的角度指数在很大程度上对关节角度变化不敏感。观察者内部和观察者之间的协议似乎很适合临床使用，其受试者内标准差（<1.3°）和变异系数（<2.2％）低，而组内相关系数高（> 0.89）。结论使用所描述的角度指数，可以在各种尾关节角处评估Pat骨近端位置。需要进一步的工作来定义各种犬种的参考间隔。具有较低的受试者内部标准偏差（<1.3°）和变异系数（<2.2％），以及较高的组内相关系数（> 0.89）。结论使用所描述的角度指数，可以在各种尾关节角处评估Pat骨近端位置。需要进一步的工作来定义各种犬种的参考间隔。具有较低的受试者内部标准偏差（<1.3°）和变异系数（<2.2％），以及较高的组内相关系数（> 0.89）。结论使用所描述的角度指数，可以在各种尾关节角处评估Pat骨近端位置。需要进一步的工作来定义各种犬种的参考间隔。