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Loosening of the anterolateral capsule affects the stability after arthroscopic lateral ankle ligament repair of chronic ankle instability

  • Orthopaedic Surgery
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Abstract

Purpose

Arthroscopic anterior talofibular ligament (ATFL) repair for chronic lateral ankle instability (CLAI) has been widely performed. The recurrence of the instability after the surgery sometimes occurs, which may cause the development of osteoarthritis. Therefore, it is important to elucidate the factors of the recurrence. This study aimed to evaluate the loosening of the capsule in the MRI and whether it affected clinical outcomes or not in arthroscopic ATFL repair.

Materials and Methods

Thirty-eight ankles in 35 patients with CLAI treated by arthroscopic lateral ligament repair were included. The capsule protrusion area defined as the area that protruded ATFL laterally from the line connecting the fibula and talus attachment on MRI was measured. Capsule protrusion area in ankles with or without CLAI was compared and the relationships between it and clinical outcomes were assessed.

Results

The capsule protrusion area in the CLAI group (74.2 ± 36.4 mm2) was significantly larger than that in the control (25.5 ± 14.3 mm2) (p < 0.01). The capsule protrusion area in the poor remnant group (93.8 ± 36.4 mm2) was significantly larger than that in the excellent (53.2 ± 40.3 mm2) (p < 0.05). The capsule protrusion area in the patients with recurrent instability (99.8 ± 35.2 mm2) was significantly larger than that without recurrent instability (62.4 ± 30.9 mm2) (p < 0.01). Clinical scores in the recurrent group were significantly lower than those in the non-recurrent group (p < 0.05).

Conclusions

Capsule loosening would be one of the causes of the recurrence of instability after arthroscopic lateral ankle ligament repair. Evaluation of the capsule protrusion area on MRI is helpful to choose appropriate surgical procedures for CLAI patients.

Level of evidence

4.

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Data availability

Datasets analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We would like to thank Editage (www.editage.com) for English language editing.

Funding

No funds were received in support of this study.

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Authors

Contributions

TN collected and analyzed the data and drafted the manuscript. YI, JS, AN and APWYL collected and analyzed the data. NA gave final approval to the manuscript.

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Correspondence to Tomoyuki Nakasa.

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The study was approved by the local ethics committee of our university.

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Nakasa, T., Ikuta, Y., Sumii, J. et al. Loosening of the anterolateral capsule affects the stability after arthroscopic lateral ankle ligament repair of chronic ankle instability. Arch Orthop Trauma Surg 144, 189–196 (2024). https://doi.org/10.1007/s00402-023-05076-6

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