Purpose
To investigate whether anterior tibial subluxation obtained from magnetic resonance
imaging (MRI) could be a predictor of high-grade rotatory instability for anterior
cruciate ligament (ACL) injuries, including acute and chronic cases.
Methods
From September 2016 to August 2018, we retrospectively investigated 163 patients with
ACL injuries who subsequently underwent primary ACL reconstruction. Among them, 30
patients with high-grade rotatory instability (grade II/III pivot shift) were included
in the high-grade group, and their age and sex were matched 1:2 to low-grade cases
(<grade II pivot shift). On preoperative MRI, we measured anterior tibial subluxation,
posterior tibial slope, as well as the time from injury to surgery. Meniscal lesions
were documented from arthroscopy. Multivariable logistic regression was used to determine
predictors of high-grade rotatory instability. Furthermore, subgroup comparisons between
2 groups were divided into acute (≤3 months) and chronic (>3 months) phases.
Results
The high-grade group had a larger anterior tibial subluxation of lateral compartment
(8.1 mm vs 5.9 mm; P =.004) than the low-grade group, whereas no significant difference was found in anterior
tibial subluxation of medial compartment (P > .05). Moreover, high-grade anterior tibial subluxation of lateral compartment (≥6
mm) was found to be an independent predictor (odds ratio, 12.992; P = .011) associated with concomitant meniscal tears after ACL injuries. Anterior tibial
subluxation of lateral compartment demonstrated statistical significance between the
two groups when comparing subgroups within 3 months but not beyond 3 months.
Conclusion
In ACL-injured patients, high-grade anterior tibial subluxation of lateral compartment
(≥6 mm) could be a unique predictor of high-grade knee rotatory instability for acute
but not chronic injuries. Prolonged time from injury to surgery and lateral meniscus
tears were risk factors for high-grade rotatory laxity in chronic patients.
Level of Evidence
Level III, retrospective prognostic trial.
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Article Info
Publication History
Published online: May 09, 2022
Accepted:
April 19,
2022
Received:
September 9,
2021
Publication stage
In Press Journal Pre-ProofFootnotes
An Liu and Wushi Cui contributed equally to this work.
The authors report the following potential conflicts of interest or sources of funding: Supported by the National Natural Science Foundation of China ( 81802170 , 81972077 ). Full ICMJE author disclosure forms are available for this article online, as supplementary material.
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