The fight between Ryan Jimmo and Jimi Manuwa at last night's UFC Fight Night 30 ended unusually in the second round when Jimmo collapsed in pain from an apparent non-contact left leg injury. The GIF of the injury (courtesy of ZombieProphet) gives us a chance to examine the possible injuries that occurred.
After taking a knee to the head, Jimmo takes three bouncing steps back. On the third step, two things happen. First, his left knee seems to hyperextend slightly. Second, he rolls his left ankle a little, combined with a quick stretch to the left Achilles' tendon. He immediately goes down to the mat, avoiding further weight bearing on the leg.
There are a few injuries that are possible. First, the hyperextension could have caused internal damage to the knee, such as a cruciate ligament injury. A hamstring injury is also a possibility. Interestingly, Jimmo did not grab for his knee or his hamstring which is a typical response to an acute injury at these areas. Secondly, the lateral (outside) ligaments of Jimmo's ankle could have been damaged when he rolled it. Finally, the quick stretch to the Achilles tendon could have caused some damage such as a tear to the Achilles or calf muscle.
Earlier this morning, Dr. Chris Lam, the Chief Medic for UFC U.K., commented on Jimmo's leg injury via Twitter in response to an inquiry from a UK physical therapist.
@Allpowersphysio looks ok— Chris Lam (@cagedoc) October 27, 2013
So early indications seem to suggest that Jimmo did not suffer a serious injury, but further diagnostic imaging tests are probably on tap for Ryan in the coming days to further define any injury that he did suffer.
Manuwa's last fight ended in a similar fashion at UFC on Fuel TV 7, when Cyrille Diabate retired after the first round due to an Achilles/calf injury.