New York Giants defensive tackle Fred Robbins’ knee surgery was more serious than initially thought. Originally billed as arthroscopic surgery, Robbins revealed on his blog that he underwent microfracture knee surgery, per Ralph Vacchiano of the New York Daily News. “I’m ready to get back to work, but I’m being held out to get my knee healthy and strong again after microfracture surgery,” Robbins wrote. “We’re taking our time with it, just making sure I’m at my best health for training camp. I don’t want to rush it and it’s getting stronger and healthier each day.” On Monday, Giants coach Tom Coughlin indicated that Robbins’ return would “be a little slower,” than defensive tackle Barry Cofield’s timetable. Cofield is also on the mend following offseason knee surgery. Robbins, who’s entering a contract year, said that he has recuperated from a shoulder injury and two broken hands from last season. “We’re just taking it slow with my knee,” Robbins wrote. Of course, microfracture surgery is not always a sure-fire cure to repair damaged cartilage. As Vacchiano points out, the Giants obtained a couple of expensive insurance defensive line policies in case Robbins is sidelined for a while. The Giants signed Chris Canty to a six-year, $42 million contract and Rocky Bernard to a four-year, $16 million pact.