Cruciate ligament injury

Corgi/Pomeranian Mix, FS, 11 years. Elevated hepatic enzymes, decreased detail in cranial abdomen on radiographs. History of chronic bronchitis- stable on prednisone 5mg EOD. Suspect acute CCL injury 3 days ago- started on tramadol.  Medications: Prednisone 5mg SID-EOD, tramadol 50mg 1 PO TID PRN.