Abstract
Menisci are important intra-articular structures whose main function is attributed to load transmission and impact absorption, reducing biomechanical stress and providing greater osteoarticular stability. In dogs, knee-related disorders are described as the main causes of claudication. This report aims to describe a case of lateral meniscal lesion in a canine without signs of femorotibiopatellar instability, whose main change was claudication. The diagnosis was confirmed through orthopedic evaluation and magnetic resonance imaging, in which an anechogenic line of dissolution of meniscal continuity and intact ligament structures was visualized. As a treatment, the technique of total meniscectomy was chosen, which allowed the recovery of limb function and absence of clinical manifestations.  
Highlights
The diagnosis of the meniscus injury is raised as a suspicion through orthopedic evaluation in which there may be the Finochietto sign, which is a palpable or audible "click" during the movement of the joint generated by the displacement of the ruptured meniscus cranially and caudally between the femoral condyles and the tibia (HOULTON et al, 2006; VALEN et al, 2017; VÉREZ-FRAGUELA et al, 2017)
Imaging tests are recommended for the definitive diagnosis of the lesion, and among them magnetic resonance imaging is the most used, with sensitivity and specificity of 93% and 88% for ruptures of the medial meniscus and 79% and 95% for the lateral (HOULTON et al, 2006)
Krier et al (2018) suggested in their study that the complete lateral meniscal lesions are commonly isolated and present in dogs clinically similar to cranial cruciate ligament ruptures, in agreement to the reported in this case, in which the clinical manifestations were similar to the CCLR, and the suspicion of meniscal lesion appeared due to the absence of instability of the joint
Summary
Menisci are intra-articular structures composed of circumferential bundles of collagen, presented in the dogs in a transversal form with a triangular shape covering half to two thirds of the joint surface of the corresponding tibial plateau, medially presenting larger dimensions with a polygonal shape and laterally circular. The diagnosis of the meniscus injury is raised as a suspicion through orthopedic evaluation in which there may be the Finochietto sign, which is a palpable or audible "click" during the movement of the joint generated by the displacement of the ruptured meniscus cranially and caudally between the femoral condyles and the tibia (HOULTON et al, 2006; VALEN et al, 2017; VÉREZ-FRAGUELA et al, 2017). The treatment of ruptures may vary according to the species in question, the location and presentation of the lesion, and includes conservative clinical treatment that demonstrates good results with the use of platelet rich plasma, meniscus repair that may include different suture techniques and materials, and partial or total meniscectomy (SCHULZ, 2014; FOX et al, 2015; DeCAMP et al, 2016; VÉREZ-FRAGUELA et al, 2017). The patient returned for reassessment after 15 days postoperatively, presenting complete clinical recovery with no claudication of the operated limb and no changes to the orthopedic examination, and was discharged from hospital
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