Figure 2: Comparative radiographic (a) and gross (b, c) anatomy of the canine stifle (top row) and human knee (bottom row). The radiographic images show osteoarthritic joints while the gross images show normal patellofemoral joints (b) and normal tibial plateaus (c). The canine stifle joint is approximately 3.5–5 cm from medial to lateral edge for medium to large breed dogs (upper left panel a) compared to approximately 7–10 cm for the human knee joint (lower left panel a) reprinted with permission from [75].