ACL Size and Notch Width Between ACLR and Healthy Individuals: A Pilot Study

Overview

Journal Sports Health

Publisher Sage Publications

Specialty Orthopedics

Date 2019 Sep 19

PMID 31526322

Citations 5

Authors

Hsin-Min Wang

Sandra J Shultz

Scott E Ross

Robert A Henson

David H Perrin

Randy J Schmitz

Affiliations

Soon will be listed here.

Abstract

Background: Given the relatively high risk of contralateral anterior cruciate ligament (ACL) injury in patients with ACL reconstruction (ACLR), there is a need to understand intrinsic risk factors that may contribute to contralateral injury.

Hypothesis: The ACLR group would have smaller ACL volume and a narrower femoral notch width than healthy individuals after accounting for relevant anthropometrics.

Study Design: Cross-sectional study.

Level Of Evidence: Level 3.

Methods: Magnetic resonance imaging data of the left knee were obtained from uninjured (N = 11) and unilateral ACL-reconstructed (N = 10) active, female, collegiate-level recreational athletes. ACL volume was obtained from T2-weighted images. Femoral notch width and notch width index were measured from T1-weighted images. Independent-samples tests examined differences in all measures between healthy and ACLR participants.

Results: The ACLR group had a smaller notch width index (0.22 ± 0.02 vs 0.25 ± 0.01; = 0.004; effect size, 1.41) and ACL volume (25.6 ± 4.0 vs 32.6 ± 8.2 mm/(kg·m); = 0.025; effect size, 1.08) after normalizing by body size.

Conclusion: Only after normalizing for relevant anthropometrics, the contralateral ACLR limb had smaller ACL size and narrower relative femoral notch size than healthy individuals. These findings suggest that risk factor studies of ACL size and femoral notch size should account for relevant body size when determining their association with contralateral ACL injury.

Clinical Relevance: The present study shows that the method of the identified intrinsic risk factors for contralateral ACL injury could be used in future clinical screening settings.

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