Sean Dempsey / AP

Mike Tyson is tended to in his corner after being knocked out in the fourth round by Danny Williams on Friday. Tyson suffered a complex tear of the lateral meniscus in his left knee in the first round, his manager said Saturday.

updated 2:25 a.m. ET Aug. 3, 2004

LOUISVILLE, Ky. - Mike Tyson underwent arthroscopic surgery on his left knee in Phoenix on Monday to repair cartilage damage sustained during his fight with Danny Williams.

A spokesman for Tyson said Dr. Richard Emerson fixed four tears in the knee apparently suffered late in the first round of Tyson’s knockout loss to Williams in Louisville, Ky. on Friday.

Fred Sternburg said the damage was more severe than anticipated and the doctor was surprised that Tyson fought after hurting the knee.

Tyson was stopped at 2:51 of the fourth round by a barrage of punches from Williams, who was once the British heavyweight champion. The 38-year-old Tyson was trying to come back after a 17-month layoff.

Sternburg said the doctor estimated Tyson’s knee would be 90 percent healed in eight weeks

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