Doctors at Boston Children’s Hospital say they have developed a new technique to repair ACL tears.

The revolutionary procedure allows the knee ligament to heal itself. 

Doctors say they thread the torn ACL through a sponge, injecting it with blood, and wait for cells to grow.

The procedure is still in it trial stage, but doctors say so far, it’s a success.

Doctors have performed the procedure on 10 patients, and all ligaments have been healed.

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