Peer-reviewed veterinary case report
X-ray measurements used to assess medial patellar luxation in dogs
By Mortari, Ana C et al.·Published in The Canadian veterinary journal = La revue veterinaire canadienne·2009·o Paulo State University, Brazil·View original on PubMed →
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Original publication title: Use of radiographic measurements in the evaluation of dogs with medial patellar luxation.
- Species:
- dog
Plain-English summary
A group of dogs with medial patellar luxation (a condition where the kneecap slips out of place) underwent surgery to correct the issue. Researchers used X-rays to measure angles related to the knee joint before and after the surgery. They found that while most angles didn’t change significantly, the quadriceps angle did show differences between some grades of luxation. This suggests that measuring the quadriceps angle before surgery and the inclination angle afterward could help evaluate dogs with more severe cases. Further studies are needed for dogs with the most severe luxation.
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Abstract
This prospective study used radiographic techniques to evaluate the inclination, Norberg, quadriceps and femoral varus angles, and the patellar position in dogs with developmental medial patellar luxation. The study also compared these measurements pre- and post-operatively to determine how they were affected by surgical procedures. Eighteen dogs with unilateral or bilateral luxation were used, and 4 groups were established according to luxation grade. Except for the quadriceps angle, there was no difference among the groups preoperatively. Significant differences for the quadriceps angle were observed between Grades 1 and 3, and between Grades 2 and 3. The Norberg and femoral varus angles and the patellar position showed no changes between pre- and postoperative groups. However, measurements of the preoperative quadriceps angle and postoperative inclination angle may be useful for evaluating dogs with grade-3 luxation. Further studies using other imaging techniques are required in dogs with severe grade-4 luxation due to the difficulty in obtaining a good radiographic position.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/20046606/