Summary of studies comparing two different double-row constructs.
|Study design||Repair type||N||Follow-up||Relevant findings|
|Spang et al. (2009) ||Cadaveric (ovine)||TOE vs. Knotless TOE||10 fresh frozen cadavers in each group||–||No significant difference between two constructs|
|Nassos et al. (2012) ||Cadaveric (human)||TOE vs. Knotless TOE||6 fresh frozen cadavers in each group||–||TOE repair technique best prevents leakage onto the rotator cuff footprint compared with knotless TOE repairs|
|Busfield et al. (2008) ||Cadaveric (human)||TOE vs. Knotless TOE||6 fresh frozen cadavers in each group||–||The addition of a knotless medial row compromises the construct leading to greater gapping and failure at lower loads|
|Burkhart et al. (2009) ||Cadaveric (human)||Double Row vs. Knotless TOE||7 fresh frozen cadavers in each group||–||Similar yield loads, ultimate loads, and cyclic displacements between two constructs|
|Hein et al. (2015) ||Systematic review||Double Row vs. TOE||32 studies; 1353 repairs||Minimum 1 year||No differences in retear rates were found|
|Kim et al. (2012) ||Retrospective comparative study||Double Row vs. TOE||26 patients in each group||Average 33 months (range, 10–54)||Comparable patient satisfaction, functional outcome, and rates of retear between two constructs|
|Rhee et al. (2012) ||Retrospective comparative study||TOE vs. Knotless TOE||59 patients in TOE, 51 patients in Knotless TOE group||Average 22 months (range, 12–34)||Similar clinical results between two constructs. However, the knotless group had a significantly lower retear rate compared with the conventional knot-tying group|
|Millett et al. (2017) ||Retrospective comparative study||TOE vs. Knotless TOE||155 shoulders in 151 patients||Average 2.9 years (range 2.0–5.4 years)||The repair technique did not affect the final functional outcomes, but patients with Knotless TOE were less likely to have a full-thickness rotator cuff retear|
|Boyer et al. (2015) ||Prospective comparative study||TOE vs. Knotless TOE||38 patients in TOE, 35 patients in Knotless TOE group||Average 29 months (range, 23–32)||Both bridging repair techniques achieved successful functional outcomes. In terms of structural outcome, the knotless TOE construct showed a lower but not significant retear rate|
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