6Background and Purpose: Irreparable Rotator Cuff Tears (RCTs) is a common cause of pain in adult 7 population, requiring in many cases a surgical treatment. Possible alternatives are debridement, partial repair, 8 muscle transfers and joint replacement. We evaluated two groups of patients with irreparable rotator cuff tear 9 treated surgically: one group received an arthroscopic assisted Latissimus Dorsi tendon transfer (LDTT), and 10 the other an arthroscopic rotator cuff partial repair. Aim of our study is to compare clinical results and 11 quality of life in two groups of patients with massive irreparable rotator cuff tear: one receiving an 12 arthroscopic Latissimus Dorsi tendon transfer and the other receiving an arthroscopic rotator cuff partial 13 repair. 14 Methods: 40 patients were assigned to two groups: 20 patients to group TT treated with latissimus dorsi 15 tendon transfer and 20 patients to group PR treated with a partial repair. The average follow-up duration was 16 2.8 years (1-5; SD: 3). Pre-and post-operative modified-UCLA shoulder score, ROM, measurement of the 17 strength and the RC-QOL were used to asses the outcome.

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