Hypoechoic ultrasonographic findings in the patellar ligaments are common in riding and trotting horses in training (116 cases).

12 A highly significant correlation between increased power Doppler signal and histopathological findings supports the value of this imaging technique. 13 Ultrasonography of the equine stifle was first described in 1990 14 , and it is now widely used as an important tool for diagnosing injuries in this complex joint. 15 , 16 However, only a few studies have examined the normal and abnormal appearance of the PLs in horses.

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