LOW-FIELD MAGNETIC RESONANCE IMAGING OF EARLY SUBCHONDRAL CYST-LIKE LESIONS IN INDUCED CRANIAL CRUCIATE LIGAMENT DEFICIENT DOGS |
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| Authors: | Debra K Baird DVM John T Hathcock DVM MS Steven A Kincaid DVM MS PhD Paul F Rumph DVM MS John Kammermann MS William R Widmer DVM MS Denise Visco PhD Donald Sweet MD |
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| Institution: | Department of Radiology (Baird, Hathcock) and the Department of Anatomy and Histology (Baird, Kincaid, Rumph, Kammermann), Auburn University;the Department of Veterinary Clinical Sciences, Purdue University (Widmer);Bayer Inc., West Haven, CT (Visco);and Department of Defense, Armed Forces Institute of Pathology, Washington, DC (Sweet). |
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| Abstract: | Six healthy adult male mongrel dogs underwent cranial cruciate ligament transection in the left stifle. Survey radiography of both stifles and low-field (0.064 T) MRI of the left stifle were performed preoperatively and at 2, 6, and 12 weeks postoperatively. Focal changes in signal intensity were seen with MRI in the subchondral bone of the medial tibial condyle at 2 and 6 weeks postoperatively. At 12 weeks postoperative, a cyst-like lesion was detected using MRI in the subchondral bone of the medial tibial condyle in 4 of 6 dogs and a less defined lesion at this site in the remaining 2 dogs. The cyst-like lesion was spherical in shape and showed typical characteristics of fluid with low signal intensity on T1-weighted images, high signal intensity on T2-weighted images and high signal intensity on inversion recovery images. The lesion was seen in the subchondral bone of the caudal medial and/or middle region of the tibial plateau slightly cranial to the insertion of the caudal cruciate ligament. No subchondral cysts were seen in the tibia on radiographs. Histopathologically, the tibia was characterized by a loose myxomatous phase of early subchondral cyst formation. |
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| Keywords: | low-field magnetic resonance imaging canine stifle joint subchondral cyst cranial cruciate ligament osteoarthritis |
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