Interference screw insertion angle has no effect on graft fixation strength for insertional Achilles tendon reconstruction

  • Ziying Wu
  • Hongyun Li
  • Shiyi Chen
  • Kui Ma
  • Shengkun Li
  • Peng Zhang
  • Yinghui Hua
Knee
  • 14 Downloads

Abstract

Purpose

To compare the effect of two interference screw insertion angles on the biomechanical properties of the insertional Achilles tendon (IAT) reconstruction.

Methods

Nine matched pairs of fresh-frozen human cadaveric Achilles tendon specimens were randomized to two groups with interference screw insertion angles of 60° and 120°. The IAT reconstruction was performed by fixing the graft tendon with the interference screw. Each specimen was loaded to failure. The load at failure, stiffness, and mode of failure were documented. Differences in load at failure and stiffness were analysed.

Results

There was no statistically significant difference between the 60° and 120° groups for failure load (149.137 ± 20.836 versus 155.428 ± 28.343 N, respectively, n.s.) and stiffness (14.523 ± 2.824 N/mm versus 14.727 ± 2.192 N/mm, respectively, n.s.). The most common mode of failure was the graft pulling out of the bone tunnel when the screw broke.

Conclusions

Graft fixation at two different interference screw insertion angles for IAT reconstruction exhibited equivalent biomechanical performance. When performing this procedure, surgeons may choose the interference screw insertion angle based on personal preference.

Keywords

Chronic Achilles tendon rupture Reconstruction Interference screw 

Notes

Acknowledgements

We thank Melissa Gibbons, PhD, from Liwen Bianji, Edanz Editing China (http://www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.

Funding

The study was not supported by any funding.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no potential conflict of interest.

Ethical approval

The study was approved by the ethics committee of Fudan University and performed in accordance with the Declaration of Helsinki.

Informed consent

Patients were informed before their death, and they consented to conduct this cadaver research.

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Copyright information

© European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2018

Authors and Affiliations

  1. 1.Department of Sports Medicine, Huashan HospitalFudan UniversityShanghaiChina

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