A 45 year old woman was travelling in a car when she met with an accident. She discovered she was not able to stand up on her own due to severe pain in her left hip. She described the details of the crash to the emergency personnel who came to the conclusion that it was a ‘dashboard injury’ of the left lower limb. She complains of pain and inability to move her left lower limb. On examination, there is absence of the femoral pulse on the left side. The most probable diagnosis at this point would be,