Hello,
In regards to the BFST and its benefits for your mentioned injury. The BFST will help aid in soft tissue recovery, though would require blood flow between the two sections. Even if their is a complete tear however, there is still benefits from its use. You want to ensure a majority of swelling and inflammation has reduced prior to use. Doing so, and applying the BFST prior to any activity like PT will help stimulate blood flow in a similar effect to stretching, without risking some of the reinjury possibilities stretching and other pre-workouts can cause.
I hope this information helps, if any additional questions or concerns arise, always feel free to reach out to us at your earliest convenience and we'd be happy to assist you further.