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Background: The biomechanical stability of transosseous-equivalent rotator cuff repairs is critical for proper tendon healing. Although several studies demonstrated the effect of different types of transosseous-equivalent configurations on tendon-bone interface contact force, pressure, and area at time 0, none explored the pattern of progressive compressive force during the surgical procedure nor its implications for lateral-row anchor stress and location site.This study aimed to evaluate and compare the compressive force pattern at the tendon-bone interface during the execution of two simulated transosseous-equivalent repairs.Methods: Contact force at the tendon-bone interface was evaluated using a force sensor applied in a humeral head and rotator cuff synthetic representative model. Force was registered upon execution of the most critical surgical gestures, namely lateral anchor placement and suture limb tensioning. Repairs with medial-row sliding mechanisms were compared with non-sliding ones.Findings: The progressive contact force pattern at the tendon-bone interface for the two approaches differed. In non-sliding configurations, there was an increase of approximately 83% of the final force after suture tensioning of the first lateral anchor, while in the sliding technique, the second lateral anchor placement and suture tensioning had a greater contribution to the final contact force (68%).Interpretation: These findings can help surgeons choose the optimal site for anchor placement and reduce the risk of anchor dislodgement by taking into consideration the patient’s bone quality and the force apllied at the TBI that is sustained by each lateral anchor during the execution of these surgical techniques. |
