1. Interactive Case Tutorial

2.  Review the history and signalment for the client  Evaluate the radiographs provided  Explore the interactive images and compare the answers given with your own interpretations. When you’ve clicked on the image, click the same spot again to make the label disappear.  Answer the questions regarding a diagnosis and recommendations  Review the radiologist’s findings

3.  Signalment: 7 month old Thoroughbred colt  History: acute right pelvic limb lameness of 3 day duration  Study: lateral, caudocranial and caudolateral- craniomedial views of the stifle

4. Changes most likely normal for young patient Marked intracapsular swelling Defect in the articular surface of the medial trochlear ridge Normal physis Surrounding subchondral sclerosis Normal physis of tibial tuberosity

5. Normal lateral femoral condyle Normal fibula (separate center of ossification) Normal tibial tuberosity Normal physis Normal medial femoral condyle

6. Normal physis Defect in articular surface of medial trochlear ridge Surrounding subchondral sclerosis Normal tibial tuberosity Normal medial femoral condyle

7.  Provide a diagnosis based on your findings. Submit Osteochondrosis of the medial trochlear ridge of the right femur with marked stifle swelling Feedback Continue

8.  Provide your recommendation for this client. Submit Radiographs of the left stifle should be obtained due to the bilateral nature of this condition, Surgical exploration and debridement of the osteochondrosis lesion, Stall rest until lameness improves Feedback Continue

9.  Within the medial trochlear ridge of the femur is a dish-shaped lucency  Deep to the articular defect is moderate subchondral sclerosis  The stifle has marked intracapsular soft tissue swelling, especially in the femoral patellar portion  The cranial aspect of the patella is somewhat sclerotic, most likely due to young age

10.  Client has not yet made an appointment for left stifle radiographs or surgery