Clanton also operated on NBA all-star Yao Ming for a stress fracture in his left foot earlier last year.
Clanton said Liu would recover fully in six months and could compete again at the level he was before his injury.
However, Sun said he could not predict whether Liu would be able to be back to competitive form in time for the August 15-23 world championships.
"The tendon was a key part in his running and I will not be sure of his fully recovered until he gets on his spikes and hits the track again."
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