Collison dislocated his knee cap in a game against Wigan after trying to take down a long ball, which in reflection, he may feel would have been better headed away.
“For me it would probably have to be when I fell over and did my knee in - It might have been a bit different if that hadn't happened,” said Collison.
“It's kind of been a battle ever since then - I've just been battling on and getting out of it what I can.”
Collison was recently released after a short term contract with Championship side Ipswich Town.
He was invited back to West Ham to work on his fitness in training and using the club’s facilities, as he looks to get his career back on track.
There’s still a bit of time for Collison to try and find a club where he can have an impact before the end of this season, but he may be better off focusing on finding a club for the next campaign.
Any side he joins will have to accept his history of injury issues and manage any issues with his knee for the rest of his career.
He was popular at West Ham because he was an honest player and worked hard. If he shows the same qualities over the next couple of months, he should be fine looking ahead to the next campaign.