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First published on February 8, 2005, doi:10.1177/0363546504271204
This version was published on March 1, 2005
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The American Journal of Sports Medicine 33:388-394 (2005)
© 2005 American Orthopaedic Society for Sports Medicine

Cyclic Testing of Flexible All-Inside Meniscus Suture Anchors

Biomechanical Analysis

Thore Zantop, MD*, Ann K. Eggers, MS{dagger}, Volker Musahl, MD*, Andre Weimann, MD* and Wolf Petersen, MD*,{ddagger}

From the * Department for Trauma, Hand, and Reconstructive Surgery, Wilhelms-University Münster, Münster, Germany and the {dagger} Department of Orthopaedic Surgery, Universitätsklinikum Schleswig-Holstein, Campus Kiel, Kiel, Germany

{ddagger} Address correspondence to Wolf Petersen, MD, Klinik für Unfall, Hand, und Wiederherstellungschirurgie, Westfälische Wilhelms-Universität zu Münster, Waldeyerstr 1, D-48149 Münster (e-mail: wolf.petersen{at}ukmuenster.de).

Background: Flexible meniscus repair devices are designed to combine the benefits of rigid all-inside meniscus anchors with the biomechanical properties of sutures.

Hypothesis: Stiffness and pull-out strength of flexible all-inside suture anchors and conventional sutures under cyclic loading conditions will be comparable.

Study Design: Controlled laboratory study.

Methods: In 50 fresh frozen bovine menisci, artificial meniscus lesions were repaired with different meniscus fixation techniques: horizontal and vertical FasT-Fix, RapidLoc, and horizontal and vertical 2-0 Ethibond sutures. The specimens were cycled 1000 times between 5 and 20 N and then loaded to failure.

Results: All devices survived the cyclic loading protocol. There was no significant difference in the displacement between all repair techniques tested (horizontal FasT-Fix, 6.23 mm; vertical FasT-Fix, 5.34 mm; RapidLoc, 6.84 mm; horizontal 2-0 Ethibond, 6.03 mm; vertical 2-0 Ethibond, 5.61 mm (P > .05). Vertical and horizontal FasT-Fix suture anchors had a significantly higher stiffness and pull-out strength (94.1 N and 80.8 N, respectively) than did horizontal sutures (50.2 N) and RapidLoc devices (30.3 N) (P > .05).

Conclusions: In this study, flexible all-inside meniscus anchors (FasT-Fix) had higher pull-out strength than did conventional vertical suture techniques. Biomechanical characteristics of the flexible RapidLoc are comparable to those of horizontal sutures.

Clinical Relevance: Flexible all-inside meniscus repair devices are an alternative to conventional suture techniques.

Key Words: meniscus fixation techniques • meniscus anchors • biodegradable implants • cyclic loading • anterior cruciate ligament (ACL)




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