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Four ultrasound probes were compared in this study for their applicability in theexamination of the equine stiflejoint.The advantages and disadvantages of the different frequencies and types of the canners (linear-array or sector scanner) were considered and the technicaldifferences of the probes and ultrasound machines were shown by describing the differences in the appearance of the anatomical structures and tissues.Therefore imaging planes were proposed and an examination guide was developed and differences between a weight-bearing and a non-weight-bearing respectively flexed position of the hindlimb were considered. In the latter e.g. the cranial cruciate ligament could be visualized and the appearance of the medial meniscus was improved.The study was performed with six clinically sound, adult trotters of both sexes.First the stifles were scanned with a 7,5-MHz-linear array transducer (Oculus CS 9100, Picker) and then the results were compared to the appearance of the tissues and tructures when using sector transducers of different frequencies (3 MHz, 5 MHz and 10 MHz, Orion, Philips, and 7,5 MHz, Opus 1, Ausonics).Measurements were made of some clinically relevant structures with the 7,5-MHzlinear array transducer, which should be seen as first datas and further examinations of larger groups of horses are needed.The whole stille region is visualized best with a 7,5 MHz or a 5,0 MHz probe. Linear array and sector probes are equal. Only in the caudal aspect a sector probe is required.The equine stille joint with its large masses of soft tissue is a very interesting region for the sonographical examination. Ultrasound as a non-invasive and reasonable method which doesn"t require hospitalization is an important addition to radiology, arthroscopy and clinical examination of the equine stifle joint.