Objective Cats rely on their forelimb mobility for everyday activities including climbing and grooming. Supination and pronation of the forelimb in cats are considered to primarily involve the antebrachium, rather than the carpus. Therefore, our null hypothesis was that there would be no movement of the carpal bones (radial carpal bone, ulnar carpal bone and accessory carpal bone) relative to the ulna during supination and pronation.

Study Design Eight feline cadaveric forelimbs were rotated from supination to pronation in a jig and computed tomography was performed in the neutral, supinated and pronated positions. The individual carpal bones were segmented from computed tomography images of the supinated and pronated scans in each of the eight specimens. A feline ulna coordinate system was established and used to quantify the translations and rotations between bones of the proximal carpal row and antebrachium.

Results After the carpus was rotated from the initial supinated position into pronation, there was significant translation (x, y and z axes) and rotation (x and y axes) of the proximal row of carpal bones based on absolute magnitude values. Given the differences in translations and rotations of the proximal row of carpal bones, our null hypothesis was rejected.

Conclusion The proximal row of carpal bones translate and rotate independently from the ulna in the cat during pronation of the antebrachium. This may have future implications in the diagnosis and management of feline carpal injuries involving the antebrachiocarpal joint.

目标 猫依靠前肢活动性进行日常活动，包括攀爬和梳理毛发。猫前肢的旋后和旋前被认为主要涉及前臂，而不是腕骨。因此，我们的无效假设是在旋后和旋前期间，腕骨（桡骨腕骨、尺骨腕骨和副腕骨）不会相对于尺骨移动。

研究设计 八只猫的尸体前肢在夹具中从旋后旋转到旋前，并在中立、旋后和旋前位置进行计算机断层扫描。从八个样本中每一个的旋后和旋前扫描的计算机断层扫描图像中分割出单个腕骨。建立了猫尺骨坐标系并用于量化近端腕骨和前臂骨之间的平移和旋转。

结果 在腕骨从初始旋后位置旋转到旋前后，基于绝对幅度值的腕骨近排有显着的平移（x、y和z轴）和旋转（x和y轴）。鉴于近排腕骨的平移和旋转的差异，我们的原假设被拒绝。

结论 在前臂旋前期间，近端一排腕骨独立于猫的尺骨平移和旋转。这可能对涉及前臂腕关节的猫腕损伤的诊断和管理具有未来意义。