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Association between anatomical risk factors and medial meniscus posterior root tears: a retrospective study
Nie Si1, Li Hongbo2, Gao Jingping2
1Department of Radiology, Jiangxi Provincial People's Hospital (The First Affiliated Hospital of Nanchang Medical College), Nanchang, 330006, P.R. China.
Background:
The purpose of this study was (a) to investigate the association between the potential anatomical risk factors and medial meniscus posterior root tears (MMPRTs), and (b) to determine the optimal cutoff values of risk factors for discriminating MMPRTs.
Methods:
A retrospective study was conducted, from January 2018 to January 2020, 86 patients with MMPRTs identified by an experienced musculoskeletal radiologist using 3-T magnetic resonance imaging (MRI), and also confirmed during arthroscopic surgery were included in this study. Moreover, MMPRTs patients were matched with 128 patients with other types of medial meniscal tear knees at the same period according to patients' demographics. We categorized the two patient groups into subgroups based on the causes of meniscus root tears. A subgroup analysis was performed to evaluate the parameter differences between traumatic and degenerative MMPRT in these groups. The associations between clinical and anatomic factors and MMPRTs were analyzed. Additionally, a logistic regression analysis was performed to detect risk factors correlated with MMPRTs.
Results:
Based on the analysis, binary logistic regression models analysis indicated that medial posterior tibial slope (MTS) (odds ratio (OR) = 1.212, P = 0.005), hip knee ankle (HKA) (OR = 1.657, P < 0.001) and medial femoral condyle length/medial tibial plateau length (MFCL/MTPL) (OR = 16.597, P = 0.019) were the risk factors correlated with MMPRTs. A subgroup analysis revealed that the MTS, HKA, and MFCL/MTPL were risk factors associated with traumatic MMPRTs. Additionally, age, MTS, HKA, and MFCL/MTPL were identified as risk factors linked to degenerative MMPRTs. Additionally, the receiver operating characteristic (ROC) curves demonstrated these factors had comparable accuracy at predicting MMPRTs (under the curve were 0.635, 0.700 and 0.627, respectively). The cutoff values of those factors were 7.4º, 2.4º, and 1.2, respectively.
Conclusions:
Based on results from the current study, we identified MTS > 7.4º, HKA > 2.4º and MFCL/MTPL > 1.2 were the risk factors correlated with MMPRTs.
Insights
Anatomical factors like medial posterior tibial slope (MTS), hip knee ankle (HKA), and MFCL/MTPL ratio are associated with medial meniscus posterior root tears (MMPRTs). These findings help identify individuals at higher risk for this knee injury.
Area of Science:
- Orthopedic Surgery
- Radiology
- Biomechanics
Background:
- Medial meniscus posterior root tears (MMPRTs) are a significant cause of knee dysfunction.
- Identifying anatomical risk factors is crucial for understanding MMPRTs etiology and prevention.
- Previous studies have explored various factors, but optimal discriminators for MMPRTs require further investigation.
Purpose of the Study:
- To investigate the association between potential anatomical risk factors and MMPRTs.
- To determine optimal cutoff values for these risk factors in discriminating MMPRTs.
Main Methods:
- Retrospective study of 86 patients with MMPRTs and 128 control patients with other medial meniscal tears.
- 3-T magnetic resonance imaging (MRI) used for identification and confirmation of MMPRTs.
- Logistic regression and receiver operating characteristic (ROC) curve analyses performed to identify risk factors and cutoff values.
Main Results:
- Medial posterior tibial slope (MTS) (>7.4º), hip knee ankle (HKA) angle (>2.4º), and medial femoral condyle length/medial tibial plateau length (MFCL/MTPL) ratio (>1.2) were significant risk factors for MMPRTs.
- These factors were associated with both traumatic and degenerative MMPRTs.
- ROC analysis indicated comparable accuracy for these factors in predicting MMPRTs.
Conclusions:
- Elevated MTS, HKA, and MFCL/MTPL ratio are significant anatomical risk factors for MMPRTs.
- The identified cutoff values can aid in discriminating individuals at risk for MMPRTs.
- These findings contribute to a better understanding of MMPRTs and may inform clinical assessment and prevention strategies.
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