Arthroscopic rotator cuff repair (ARCR) is the most frequently performed shoulder surgery in patients aged 50 to 70 years.22,23 The incidence of degenerative rotator cuff tears is clearly age-related, but traumatic events may cause cuff tears in all adult age groups.12,39,40 The distinction between degenerative and traumatic tear etiology is important because the success of tendon repair may be limited by the restricted regenerative properties of degenerated tendons.2,13,28 Nonetheless, these...