Computed Tomographic Morphology of the Synovial Invaginations of the Distal Sesamoid Bone of the Horse
2011
With 4 figures SUMMARY: The morphological features of the distal border synovial invaginations (SI) of the distal sesamoid bone (DSB) in horses were described by the use of computed tomography (CT). Transverse CT images were obtained on 50 cadaver forefeet from 25 Warmblood horses. Dorsal and sagittal planes were reformatted. The CT images allowed the evaluation of the number, shape, depth of penetration and direction of the SI into the bone. The total number of SI was 295 (mean 5.9). The number of invaginations in a particular DSB ranged from 3 (n = 3), 4 (n = 6), 5 (n = 11), 6 (n = 12), 7 (n = 13), 8 (n = 3), 9 (n = 1) to 11 (n = 1). The shape of the SI was ‘conical' (n = 118), ‘linear' (n = 109), ‘lollipop' (n = 38) or ‘branched' (n = 30). Penetration of the SI into the DSB was ‘mild' in 195 cases, ‘moderate' in 67 cases and ‘deep' in 33 cases. The SI ran in a ‘straight', ‘dorsoproximal' and ‘palmaroproximal' direction in 187, 28 and 80 cases, respectively. In only six DSBs, all SI ran in the same direction. The images obtained in this study may serve as reference for the radiographic evaluation of these SI.
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