A technique for arthroscopic-assisted lower trapezius transfer using an Achilles tendon allograft augmented with acellular dermal matrix to treat posterior superior irreparable rotator cuff tears in the lateral decubitus position.

Lower trapezius tendon transfer has emerged as an effective treatment option with promising clinical outcomes for patients with posterior superior irreparable rotator cuff tears (PSIRCTs). This technique has gained considerable attention for PSIRCTs, with various modifications proposed by different authors. In this report, we present an arthroscopic-assisted approach to lower trapezius tendon transfer in patients with PSIRCT using an Achilles tendon allograft that is reinforced with an acellular dermal matrix graft. The procedure is conducted with the patient in the lateral decubitus position.