NAVLE（北美执业兽医考题）Day 707

A 2-year-old female spayed German shepherd is presented with recurrent left thoracic limb lameness that is aggravated by exercise. Which one of the following choices is the most likely diagnosis?
一只2岁雌性已绝育德国牧羊犬由于左前肢重复出现跛行并且运动后症状加剧前来就诊。以下哪个选项是最可能的诊断？