Acta Orthopaedica et Traumatologica Turcica
Research Article

Knotless anchors offer better prevention of meniscal excursion than knotted anchors: An experimental study of the bovine knee

1.

Department of Orthopaedics and Traumatology, Tokat Gaziosmanpaşa University, School of Medicine, Tokat, Turkey

2.

Department of Orthopaedics and Traumatology, Eskişehir Acıbadem Hospital, Eskişehir, Turkey

3.

Department of Mechanical Engineering, Middle East Technical University, Ankara, Turkey

AOTT 2020; 54: 97-103
DOI: 10.5152/j.aott.2020.01.439
Read: 1353 Downloads: 469 Published: 02 March 2020

Objective: Due to the biomechanical importance of the meniscal root ligament, several surgical techniques have been defined in order to treat meniscal root tear. Different application techniques have different levels of difficulty. We aimed to find a stronger and simpler repair technique. 

Methods: Sixteen bovine knee joints were prepared. The posterior root of the medial meniscus was dissected and repaired with one of two different techniques. The knees in group 1 (“knotted group”) were repaired with the knotted suture anchor technique, and the knees in group 2 (“knotless group”) were repaired using the knotless suture anchor technique. The strength of the repairs was tested biomechanically. 

Results: Cyclic loading tests were done. On the 0–20 N one-cycle test, the knotted anchor group’s equivalent stiffness average was 5.28 N/mm, and the knotless anchor group’s equivalent stiffness average was 5.48 N/mm. The 5–20 N two-cycle test results were 8.29 N/mm for the knotted group and 8.66 N/mm for the knotless group. On the 5–20 N 100-cycle test, the equivalent stiffness averages were 8.59 N/mm for the knotted group and 10.18 N/mm for the knotless group. Elongation was 5.83 mm for the knotted group and 4.86 mm for the knotless group. After performing load-to-failure tests, the failure forces were recorded as 237.83 N for the knotted group and 204.90 N for the knotless group. The failure test elongation values were 26.83 mm for the knotted group and 18.70 mm for the knotless group. The failure energies were 3.87 J for the knotted group and 1.83 J for the knotless group. Except for elongation until failure (p=0.009), there were no significant differences between the two groups tested (p>0.05). The average elongation was significantly less in group 2, showing that the knotless anchor had an advantage, with less meniscal excursion compared to the sutured anchor. 

Conclusion: Knotless anchors have a mechanical advantage over knotted anchors for preventing meniscal excursion. When thought together with technical simplicity during arthroscopic surgery, knotless anchors could be used safely for the fixation of the meniscal root ligament. 

Cite this article as: Eren MB, Aşçı M, Tönük E, Balta O, Kurnaz R. Knotless anchors offer better prevention of meniscal excursion than knotted anchors: An experimental study of the bovine knee. Acta Orthop Traumatol Turc 2020; 54(1): 97-103.

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ISSN 1017-995X EISSN 2589-1294