Heat shrinks lax ACL. Thermal shrinkage for ACL stretch or partial injuries can provide short term benefit for ACL laxity, but leads to catastrophic failure with longer term follow-up. Thermal shrinkage can no longer be recommended for the treatment of ACL laxity.
Controversial. This type of procedure is advocated by some surgeons in an effort to avoid revision ACL reconstruction surgery. I do not advocate it as the thermal activity can damage the ACL graft tissue and will not (and has not been supported in the literature) have any long term effect on the loose graft. If the knee/graft is loose/unstable, the surgery needs to be fully revised in my opinion.