Smith G K, LaFond E, Gregor T P, Lawler D F, Nie R C
Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia 19104, USA.
Am J Vet Res. 1997 Oct;58(10):1076-7.
To evaluate in vivo repeatability of the distraction index method of evaluating hip joint laxity in dogs.
31 two-year-old Labrador Retrievers.
Each dog was anesthetized and radiographically evaluated for hip joint laxity 4 times: twice by an experienced examiner and twice by an examiner who had no previous knowledge of or training in the technique prior to the first day of testing. Distraction indices (DI) were determined from the radiographs and intraclass correlation coefficients were calculated to evaluate the repeatability of DI measurements between and within examiners.
Intraclass correlation coefficients were high (range, 0.85 to 0.94). Lower limits of the 95% confidence intervals for the intraclass correlation coefficients ranged from 0.75 to 0.89.
Between- and within-examiner repeatabilities of DI measurements were high, suggesting that the technique is clinically reliable.
Distraction index is a reliable measure of hip joint laxity and a good predictor of the risk of development of degenerative joint disease associated with hip dysplasia in dogs. Establishment of high repeatability of DI measurements suggests that the stress-radiographic method may be used by multiple examiners with the expectation of comparable and consistent results.
评估犬髋关节松弛度牵张指数评估方法在体内的可重复性。
31只两岁的拉布拉多猎犬。
每只犬麻醉后进行4次髋关节松弛度的X线评估：由一名经验丰富的检查者评估两次，由一名在测试首日之前对该技术没有任何了解或培训的检查者评估两次。从X线片确定牵张指数（DI），并计算组内相关系数以评估检查者之间和检查者内部DI测量的可重复性。
组内相关系数较高（范围为0.85至0.94）。组内相关系数95%置信区间的下限范围为0.75至0.89。
检查者之间和检查者内部DI测量的可重复性较高，表明该技术在临床上是可靠的。
牵张指数是犬髋关节松弛度的可靠测量指标，也是与髋关节发育不良相关的退行性关节疾病发生风险的良好预测指标。DI测量具有高可重复性表明，多位检查者使用应力X线检查方法有望获得可比且一致的结果。
