This section is from the book "The Horse - Its Treatment In Health And Disease", by J. Wortley Axe. Also available from Amazon: The Horse. Its Treatment In Health And Disease.
This is a small irregular bone analogous to the knee-cap of man, and in the horse frequently becomes displaced. Behind it is covered with articular cartilage, and conies into contact with the trochlea of the femur, over which it plays in pulley-like fashion as a part of the stifle-joint.
 
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