Hall of Fame jockey Gary Stevens announced Thursday on HRTV that he needs knee replacement surgery and expects to be sidelined for six months.

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Stevens, 51, has retired twice, mainly because of knee problems, but said he plans to return to riding in "late December or early January."

After ending a seven-year hiatus in January 2013, he won three of the country's most important races, the Preakness, Breeders' Cup Distaff and Breeders' Cup Classic.