Concurrent Partial Avulsion of Popliteal and Long Digital Extensor Tendons in a Juvenile Dog

A 5-month-old, 17.8 kg intact female Chesapeake Bay Retriever presented for the evaluation of left pelvic limb lameness following trauma. The dog had been persistently weight-bearing lame for 11 days after an abnormal landing. Radiographs, magnetic resonance imaging (MRI), and ultrasonography revealed a partial avulsion of the left long digital extensor and popliteal tendons, with associated bone marrow edema, mild synovial effusion, and a low-grade lateral collateral ligament sprain. This case represents the first documented instance of concurrent partial avulsion of both tendons confirmed by MRI and ultrasonography, with successful medical management.