Laxity of Canine Hip Joint in Two Positions with Computed Tomography

Abstract

ABSTRACT. Computed tomographic (CT) examination of 20 canine hip joints was carried out in two positions, normal-standing and weightbearing. In normal (dorsal acetabular rim angle: DARA < 15°) or slightly abnormal (DARA, 15° to 20°) hip joints, the values of parameters to laxity were evaluated as more severe in the weight-bearing position. Comparisons of results using various indicators, including the center distance (CD) index, dorsolateral subluxation score, and lateral center edge angle, revealed that the CD index may be a useful marker of functional laxity in the canine hip joint under CT scanning. Further, CT scanning in the weight-bearing position was more sensitive than in the normal-standing position for the detection of laxity in hips with normal or only slightly abnormal DARA.

The relationship between the size of caudolateral curvilinear osteophyte of the canine femoral neck and the radiographic view

“…Then the coxofemoral joint evaluation was performed using the transverse CT images. The dorsal acetabular rim angle (DARA) [9], the dorsolateral subluxation score (DLS score) [3], the center distance index (CD index) [4], and the lateral center edge angle (LCEA) [4] were calculated using the measurements obtained from the transverse CT images, which included the largest diameter of the femoral head [5]. In addition, correlation coefficients were calculated to assess the relationships between radiographic-CCO, 3D-CCO, age, gender, body weight, and the CT parameters (DARA, DLS score, CD index, and LCEA).…”

Relationships of hip joint volume ratios with degrees of joint laxity and degenerative disease from youth to maturity in a canine population predisposed to hip joint osteoarthritis

“…6,7,28–33 The sensitivity of 3-D CT to detect and characterize minor hip joint abnormalities is superior to that of 2-D radiography. 10,26 Also, CT is an important imaging modality for assessment of hip joint structures in children with minor symptoms of hip dysplasia, 34 classification of human dysplastic hip joints, 20 surgical planning, 15–17,19,26,34 and postoperative assessment.…”

Quantitative Evaluation of Hip Joint Laxity in 22 Border Collies Using Computed Tomography

“…Objective evaluation requires loading of the hip in a manner similar to that achieved in a standing position rather than positioning the hip using an artificial and potentially variable traction force. CT evaluation with the hips in a weightbearing position fulfills this requirement because the hip joints are loaded by the body weight of the lumbar area [3][4][5]. However, CT evaluation of hip joints still requires accumulation of CT data for various breeds in order to establish a methodology and criteria for each breed.…”

“…In addition, the mean values for the DLS score, LCEA, DARA, CD index and NA were recalculated for the hips for which the parameters were ascertained to be within the reference range from previously published data. For the current investigation, the reference ranges were defined as follows: DLS score > 55% [3], LCEA > 94.2° [4], DARA < 15° [8], CD index < 0.22 [4] and NA >105° [12]. The correlations between the CT parameters were examined as were the correlations between the CT parameters and NA.…”

“…Loading of the animals own body weight onto the hips may be more relevant than loading in a simple prone or supine recumbent position [4]. In addition, the influence of degeneration or laxity of the hip joints on clinical signs can be inferred by loading with the animal's own body weight without any forced traction or loading.…”