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Risk factors for knee instability after anterior cruciate ligament reconstruction

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

The objective of this study was to estimate risk factors that influence postoperative instability after anterior cruciate ligament (ACL) reconstruction using multivariate logistic regression analysis.

Methods

A total of 152 consecutive patients with symptomatic ACL insufficiency underwent arthroscopic ACL reconstruction between 2005 and 2011. Loss to follow-up and previous ligament reconstruction were exclusion criteria, resulting in 131 patients remaining for this retrospective study. The median follow-up was 55 months (range 25–100 months). Patients were sorted into two groups by anterior translation on stress radiograph and pivot shift test grade and were analysed for the statistical significance of various risk factors including age at surgery, gender, body mass index, preoperative instability, time from injury to surgery, single-bundle reconstruction with preserved abundant remnant versus double-bundle reconstruction with scanty remnant, and concomitant ligament, meniscus, and articular cartilage injury with use of multivariate logistic regression analysis.

Results

Time from injury to surgery over 12 weeks was found to be a significant risk factor for postoperative instability [p < 0.001, adjusted odds ratio (OR) 6.22; 95 % confidence interval (CI) 2.14–18.06)]. Grade 2 injury of medial collateral ligament (MCL) was also a risk factor (p = 0.02, adjusted OR 13.60; 95 % CI 1.24–148.25). The other variables were not found to be a significant risk factor.

Conclusions

Among the risk factor variables, concomitant grade 2 MCL injury and surgical delay of more than 12 weeks from injury were significant risk factors for postoperative knee instability after ACL reconstruction. The overall results suggest that surgery <12 weeks from injury and meticulous attention to concomitant MCL injury should be considered.

Level of evidence

Retrospective case–control study, Level III.

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Authors and Affiliations

  1. Department of Orthopedic Surgery, Dongguk University Ilsan Hospital, 814 Siksadong, Ilsandonggu, Goyangsi, Gyeonggido, 411-773, Korea

    Ji Hyun Ahn & Sung Hyun Lee

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  1. Ji Hyun Ahn
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  2. Sung Hyun Lee
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Correspondence to Ji Hyun Ahn.

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Ahn, J.H., Lee, S.H. Risk factors for knee instability after anterior cruciate ligament reconstruction. Knee Surg Sports Traumatol Arthrosc 24, 2936–2942 (2016). https://doi.org/10.1007/s00167-015-3568-x

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  • DOI: https://doi.org/10.1007/s00167-015-3568-x

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