Lateral: 3 year old American Bulldog

  • The infra-patellar fat pad is all but obliterated and there is aparent distention of the joint caudally.
  • There is widespread osteophytosis
    • "Tidemark" caudal to trochlear ridge
    • Irregularity of fabellae
    • Cranial extent of trochlear groove
  • In this patient, as is almost always the case, the stifle OA is secondary to cranial cruciate ligament failure. Here, the tibia is displaced cranially relative to the femur - this is an occasional radiographic finding following cruciate ligament failure.