Proximal Biceps Tenodesis – Biomechanical Analysis in Sheep: Comparison between Metallic Anchor, Onlay Bioabsorbable Knotless Anchor, and Interference Screw

Abstract

Objective To biomechanically evaluate different fixation devices for the proximal biceps in the humerus of sheep, comparing their fixation strength to failure, tendon displacement, and failure site in each technique.

Methods A total of 27 humerus tests were performed on sheep, separating them into 3 groups: group A with tenodesis with metallic anchors (n = 11), group B with biocomposite knotless devices (n = 8) and group C with metallic interference screws (n = 8), performing tenodesis with the sheep's own biceps, maintaining its native distal insertion. The three methods were submitted to a universal tensile testing machine.

Results There was no statistically significant difference in the strength of fixation until failure and displacement between the tendons fixed by the different techniques. Regarding the pattern of ruptures, it was observed that most ruptures of the metallic anchors occurred at the level of the myotendinous junction, most of the bioabsorbable knotless anchors failed due to slippage of the wire-screw interface, and all interference screws failed via tendon slip.

Conclusion The three techniques with metal anchor, onlay bioabsorbable knotless anchors, and interference screws are largely resistant to tensile loads for long head of the biceps tenodesis in sheep. There was no statistical difference between the three groups. Cyclic load resistance studies can provide more valuable data for comparing groups.

Keywords

biomechanical phenomena - models, animal - orthopedic fixation devices - tenodesis

Financial Support

The authors declare that the present study received no financial support from either public, commercial, or not-for-profit sources.

Ethics

According to law number 11.794/2008, intended for the use of live animals in scientific research and teaching activities, the use of cadavers or parts of animals slaughtered for consumption is not scope of the legislation, and the study is exempt from being approved by the Commission of Ethics in the Use of Animals.

Work carried out at the Orthopedics and Traumatology Service of Hospital São Vicente de Paulo/Instituto de Ortopedia e Traumatologia, Passo Fundo, RS, Brazil.

Publikationsverlauf

Eingereicht: 08. Juni 2022

Angenommen: 08. Oktober 2022

Artikel online veröffentlicht:
07. Dezember 2024

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