Purpose
to investigate the association between the lateral femoral condylar ratio (LFCR),
the posterior tibial slope (PTS), and injury of the anterolateral ligament (ALL).
Methods
Inclusion criteria were patients with acute anterior cruciate ligament (ACL) tear
after noncontact injury during sports from October 1997 to May 2021. The LFCR and
PTS were measured, and injury of the ALL was evaluated. Patients were divided into
2 groups: isolated ACL tear (isolated group) and combined ACL with ALL tear (combined
group). The LFCR and PTS were compared between the isolated and combined groups. For
each risk factor, the receiver operating characteristic curve, the area under the
curve (AUC), and its 95% confidence interval (CI) were calculated to determine the
cutoff for detecting increased risk of ALL injury.
Results
There were 83 patients in the isolated group and 176 patients in the combined group.
Demographics of the 2 groups did not differ significantly. The LFCR was significantly
larger in the combined group than in the isolated group (P = .000). The PTS did not differ between the two groups (P = .405). The LFCR (odds ratio [OR] = 1.58; P = .000) was a significant factor. Age, body mass index, and PTS were not associated
with an ALL injury. The AUC (0.79; 95% CI, 0.74-0.85) for the LFCR had a sensitivity
of 73% and specificity of 76% to predict an ALL rupture. The calculated cutoff of
64.5 was associated with an increased risk for ALL rupture (OR = 8.65; 95% CI, 4.73-15.81)
when compared with the isolated group.
Conclusions
An increased LFCR was associated with the ALL injury. However, increased PTS was not
associated with ALL injury. These findings need to be considered for clinicians in
treating ACL tear patients at risk for an ALL injury.
Level of Evidence
III, retrospective comparative prognostic trial.
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Article info
Publication history
Published online: December 11, 2022
Accepted:
November 14,
2022
Received:
April 26,
2022
Publication stage
In Press Journal Pre-ProofFootnotes
The authors report that they have no conflicts of interest in the authorship and publication of this article. Full ICMJE author disclosure forms are available for this article online, as supplementary material.
Identification
Copyright
© 2022 by the Arthroscopy Association of North America
