Ireland W P, Rogers J, Myers R K
Am J Vet Res. 1986 Apr;47(4):837-40.
Locations of 3 instantaneous centers of joint rotation (ICR) were found in the stifles of 6 healthy dogs. A novel algorithm, verified by computer simulation, was used to determine ICR from radiographs. Comparisons of ICR locations were made between flexion and extension, between left and right limbs, and between living and dead dogs, using analysis of variance. All stifles were examined for evidence of lesions, but all were normal. The normal location of the ICR in the stifle is near the joint surface, indicating that there is a predominantly rolling type of motion. As the limb flexes, the ICR moves caudally; as the limb extends, the ICR moves cranially. Significant differences in ICR position were not found between left and right limbs or between living and dead dogs. The average ICR position was significantly more caudal during extension than it was during flexion. Knowing the normal ICR position is a preliminary to diagnosing joint abnormalities, using the ICR.
在6只健康犬的膝关节中找到了3个关节旋转瞬时中心（ICR）的位置。采用一种经计算机模拟验证的新算法，从X线片中确定ICR。运用方差分析，对屈曲与伸展之间、左右肢之间以及活犬与死犬之间的ICR位置进行比较。检查了所有膝关节是否有病变迹象，但均正常。膝关节中ICR的正常位置靠近关节面，表明主要存在滚动类型的运动。随着肢体屈曲，ICR向尾侧移动；随着肢体伸展，ICR向头侧移动。左右肢之间或活犬与死犬之间未发现ICR位置有显著差异。伸展时ICR的平均位置比屈曲时明显更靠尾侧。了解ICR的正常位置是使用ICR诊断关节异常的前提。
