Ossification or ossa sesamoidea distalia in Cattle

Č Červený,V Páral

doi:10.2754/avb199463020089

Abstract

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Highlights

The onset of ossification in cartilaginous primordia along the ossa sesamoidea distalia was depicted in radiographs taken in lateromedial and lateromedial oblique projections_In the former, ossification centres of these tiny bones were positioned close together above or next to each other, or they partially or completely overlapped so that their shadows were clearly visible in the radiographs
They were small oval spots, 1-3 mm in diameter, localized palmarly or plantarly from th~ shade of the middle phalanx trochlea (Plate I, Fig. I), Ip the oblique projection, ossification centres were always localized next to each other and their appurtenance to the third on fourth digit could only be identified from the mutual position of digits in the radiograph, which was determined by the projection used
Ossification centres for ossa sesamoidea distalia appeared in cartilaginous primordia in a regular sequence, in the pelvic limbs first and in thoracic limbs, within the first two months after birth (Figs 3 and 4)

Summary

Introduction

X-ray examination of skeletons in cattle and its correct evaluation must draw on exact anatomical and radiological knowledge This basic information can be used for a radiographical diagnosis ofskeletal diseases and for an evaluation of skeletal maturity of the animal. More accurate information on the time of appearance of ossification centres of distal sesamoid bones in digits of Ayshire calves is provided by Lin d say et al (1969). They set the interval for the frrst appearance of ossification centres of distal sesamoid bones of pelvic and thoracic limbs at 16 to 35 days after birth. Ossa sesamoidea distalia develop from ossification centres only after birth and are well depicted in radio-

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