To be honest, I 'm never quite sure what a "successful" surgery means at this stage, apart from they operated on the correct knee, and they found what the expected to find, but Sergio Asenjo's knee surgery has been deemed "successful".
This is the third time Asenjo has had knee surgery, and he certainly seemed to be smiling afterward. It took place in Madrid at a hospital there. Now the recovery process starts. Good luck, Sergio!!!