PURPOSE: The purpose of the present study is to evaluate the mechanical performance and initial strength of the arthroscopic Mason-Allen, double mattress, inclined Mason-Allen, and lasso loop stitch configurations. METHODS: Using 36 sheep infraspinatus tendons, tendon widths and thicknesses were measured with a digital caliper to confirm standardization of the tendons. Four different stitch configurations (Mason-Allen, inclined Mason-Allen, double mattress, and lasso loop) were biomechanically tested with cyclic loading followed by load to failure testing. The cyclic elongation, peak-to-peak displacement, ultimate tensile strength, stiffness, and mode of failure were recorded. RESULTS: Mean tendon widths and thicknesses were statistically the same. The lasso loop (0.7 +/- 0.1 mm) demonstrated a mean cyclic elongation greater than the Mason-Allen (0.5 +/- 0.3 mm) and double mattress (0.5 +/- 0.3 mm) groups (P = 0.011; P = 0.013). No differences were found in ultimate failure load, stiffness, and peak-to-peak displacement for the Mason-Allen (mean 99 +/- 42 N, 39 +/- 9 N/mm, 0.6 +/- 0,1 mm), inclined Mason-Allen (113 +/- 52 N, 44 +/- 14 N/mm, 0.5 +/- 0.1 mm), double mattress stitch (119 +/- 68 N, 45 +/- 10 N/mm, 0.5 +/- 0.1 mm), or lasso loop (100 +/- 38 N, 42 +/- 7 N/mm, 0.5 +/- 0.1 mm) groups (n.s.). Each specimen failed at the suture-tendon interface. Three specimens (two Mason-Allen and one inclined Mason-Allen) failed during cyclic testing. CONCLUSION: Conventional Mason-Allen configuration can be applied with double-loaded suture anchor safely. Recent modifications of the configurations offer no biomechanical advantage.
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