World champion Ouyang Xiaofang of China finished her tour in Doha with a knee injury, winning a silver medal in the women's 63kg weightlifting here on Monday.

The 23-year-old Ouyang, one of the gold medal favorites, injured her left knee when lifting 137kg and quit the competition with a total of 247kg.

"Her knee can not bend now, and we are going to take her to a local hospital for further examination," said Ma Wenhui, Ouyang's coach.

"She strained her knee and at least need one month to recover," Ma added.

"We planned to reduce the weight to 135kg, 30 seconds before the ending time for her lift, which is allowed by the weightlifting regulation. One referee refused to change and the timing clock didn't stop, so we have to let Ouyang step onto the platform to lift 137kg," Ma said.

"She lifted with a hurry because of the time limit, and that cause her injury."

"Though we lost in the 63kg, we will not give up this category in the Beijing Olympics," said Ma Wenguang, president of the Chinese Weightlifting Association.

"I am not afraid of China lost in the 63kg category, but I am worried about Ouyang's injury," he added.