The lumbosacral joint is the most mobile intervertebral joint between the cranial thoracic area and the pelvis. Rectal ultrasonographic examination of this joint can easily be performed in routine practice, and it aids identification of several typesof injuries as well as differential diagnosis with sacroiliac lesions. Treatment of lumbosacral pain has been considerably improved using ultrasonogra-phy-guided injections with a craniodorsal approach of the joint both on the left and right sides. Objective assessment of back and pelvic pain and clear identification of the cause(s) of the pain are not easy in horses. Osteoarticular thoracolum-bar lesions have been described and documented in horses. Several papers have been published on the clinical and nuclear scintigraphic evaluation of the sacroiliac joints.6"8 Ultrasonographic examination of the sacroiliac joint has also been described. Little attention has been given to the lumbosacral junction in the literature, whereas lesions have been documented in clinical cases and confirmed post-mortem in experimental studies.
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