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After four knee surgeries and hundreds of shots injected into my knee weekly to alleviate swelling and pain, my body is begging me to stop the pounding.

"Li Na, China's double grand slam winner, forced to retire with knee injury", www.theguardian.com. September 18, 2014.
After four knee surgeries and hundreds of shots injected into my knee weekly to alleviate swelling and pain, my body is begging me to stop the pounding.