ArticleOrthopaedic journal of sports medicine2026
Biomechanical Comparison of 4- and 6-Strand All-Inside Anterior Cruciate Ligament Reconstruction Grafts: The Value of Direct Tendon End Ripstop Suturing to the Adjustable Loop.
Article in Orthopaedic journal of sports medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Data comparing primary fixation of hamstring tendon (HT) grafts for all-inside anterior cruciate ligament reconstruction (ACLR) using direct ripstop (RS) suturing of free graft limbs with the adjustable loop device (ALD) versus standard grafts are lacking. Purpose: To evaluate the biomechanical effect of direct RS suturing backup fixation of free graft limbs to the adjustable loop in 4- and 6-strand HT grafts compared with standard cerclage sutured grafts in all-inside ACLR. Study Design: Controlled laboratory study. Methods: Four different HT groups (n = 8 per group) with 9-mm graft diameter were prepared: 4- and 6-strand grafts with standard cerclage suturing (4HT/6HT) and additional direct RS suturing (4HT-RS/ 6HT-RS) of the free graft limbs to the ALD. Each construct was preconditioned with graft retensioning (250 N) followed by a total of 3000 cycles. This included 1 position-controlled and 2 force-controlled load blocks (1000 cycles each), with a constant valley (10 N) and 2 different peak loads (250 N, 400 N). Residual graft force, dynamic elongation, and stiffness were analyzed. The ultimate strength was evaluated during pull to failure (50 mm/min). One-way analysis of variance and Holm-Sidak post hoc tests were used as statistical methods. Results: The maintenance of residual graft force of RS suturing groups (4HT-RS, 68.3% ± 2.8%; 6HT-RS, 72.1% ± 4.9%) was higher ( Conclusion: This study demonstrated that direct RS suturing of free graft limbs to the adjustable loop significantly decreased graft tension loss, increased construct stiffness, and reduced cyclic elongation in 4- and 6-strand all-inside HT grafts compared with standard grafts with cerclage suturing. Improved primary fixation may ensure more homogeneous load distribution across the graft limbs and reduce the risk of early clinical failure. Clinical Relevance: Direct RS suturing of the free graft ends to the ALD improved primary construct stability in all-inside ACLR, but future studies will determine if the improved time-zero biomechanics translate into favorable clinical outcomes.
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