Glenn Howard announced his retirement from competitive curling on Tuesday, ending a career that included four world titles and four Canadian championships.

The 61-year-old from Midland, Ont., cited a nagging injury to his left knee as the reason for his retirement in a social media post.

Glenn Howard announced his retirement from competitive curling on Tuesday, ending a career that included four world titles and four Canadian championships.{ai:summary}<p>Legendary curler Glenn Howard hung up his broom, blaming a bum knee for his retirement. The four-time world champion leaves a lasting legacy on the ice. #sports</p>

Four-time Canadian and world champion curler Glenn Howard retires

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