UFC superstar Georges St.Pierre underwent surgery on his ACL injury yesterday in Los Angeles and it appears to have gone well according to the man himself.

“Dr. ElAttrache says my surgery (ACL patellar tendon autograft) was huge success!” GSP wrote on his Twitter account later that day. “Ligament very strong. Thanks for support!”

It’s a welcome bit of good news for the welterweight champion after an unlucky spell that has lead to him having to pull out of two title fights in a row due to trouble with his knees, firstly spraining one knee while preparing to face Carlos Condit at UFC 137 in October, and then suffering ACL damage to his other knee as he trained to fight Nick Diaz at UFC 143 in February.

Following yesterday’s surgery St.Pierre will now undergo a long spell of rehab, with estimates of his recovery time ranging from 6-10 months. That means that he’ll have spent well over a year on the sidelines by the time he next sets foot in the Octagon, the longest absence of his 24 fight professional career.

In the mean time Nick Diaz and Carlos Condit will now fight for the UFC’s 170lb interim title with the winner then likely to face the Canadian.