Rebuilding of the hamstring

Two years ago I had an ACL recon. Even though surgery was sucsessfull the part of the hamstring used for the acl recon has never grown back and has not responded to the physio and training recomended. Could you help me please as the two hamstrings have very differing strengths and it is hampering my sprinting big time. James

can you post the “recomended” exercise program? also any information regarding height, weight, experince, age, training, choosen events etc…the more information you give us the better we will be able to help.