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Biomechanical Evaluation of a Modified Transosseous All-Suture Anchor Compared to Standard Suture Anchor in Anterior Instability Repair Of The Shoulder
ESSKA Academy. Aboalata M. May 11, 2018; 218049; FP25-1834
Dr. Mohamed Aboalata
Dr. Mohamed Aboalata
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Abstract
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Objectives: This study aims to evaluate the ultimate load to failure of a modified transosseous all-suture anchor in anterior shoulder instability repair. Bankart repair through 3 separate glenoid bone tunnels is supposed to be more stable, stiff and secure than using 3 suture anchors in the bony glenoid substance.

Methods: Twenty fresh-frozen bovine shoulders were used in two groups, each 10 specimens.
In group A, three 2.8 mm metal anchors were inserted at the 3, 4 and 5.30 O'clock positions. In group B, 3 bone tunnels were drilled transgelnoid using a 2mm drill bi tat the same positions. A special configuration of strong non-absorbable #2 polyethylene/ polyester suture passed through Suture tape to produce an all/suture anchor was used. The anchor is loaded on a special inserter and inserted trans-osseous through the glenoid from anterior to posterior till it rests against the posterior glenoid cortex. Specimens were randomly assigned to each group. Biomechanical evaluation is performed for each specimen to test the ultimate load to failure under continuous load (5N /sec).

Results: The Modified Transosseous All-Suture Anchor provide significantly higher load to failure (319 ± 43 N) than the standard metal suture anchors (189 ± 52 N) P < .001. Transosseous all-suture anchors achieve a significantly higher stiffness (28.9 ± 6.7 N/mm) than the traditional suture anchors (15.2 ± 4.5 N/mm, P <.05).

Conclusions: Bankart repair with 3 separate bone tunnels using a modified all-suture anchor would achieve higher biomechanical properties in the early postoperative phase compared to the repair using standard suture anchors. This may improve the clinical results thanks to the better healing and the earlier and more secure rehabilitation.

Keywords:
shoulder instability, Bankart repair, bone tunnels, suture anchors, all-suture anchors.
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