Achilles tendon allograft versus fascia lata autograft as the interpositional graft in arthroscopically assisted lower trapezius tendon transfer for irreparable posterosuperior rotator cuff tear

aLTT may lead to significant improvement in clinical and radiologic outcomes in PSIRCT, regardless of whether an ATA or FLA is used as the interpositional graft. The retear rate of the interpositional bridging graft was not associated with graft status. However, measures to promote graft healing should be considered. Level of evidence: III.