B-PT-B is the gold standard for a graft for reconstruction of the anterior cruciate ligament. A slice of patellar tendon is harvested from the patient, together with a bit of bone from the patella above and the tibia below - hence the name 'Bone Patellar-Tendon Bone' for the graft construct.
Arthroscopic Anatomic Single-Bundle Anterior Cruciate Ligament Reconstruction Using Bone–Patellar Tendon–Bone Autograft: Pearls for an Accurate Reconstruction. Chahla J, Moatshe G, Cinque ME, Godin J, Mannava S and LaPrade RF. Arthrosc Tech. 2017 Aug; 6(4): e1159–e1167.