| Objectives To explore the role of lateral discoid meniscus(DLM)in maintaining the local alignment of knee joint,the quantitative indexes such as the morphology of lateral femoral condyle and local alignment of knee joint on MRI of knee joint were compared among adults with complete lateral discoid meniscus(CDLM),incomplete lateral discoid meniscus(IDLM)and normal lateral meniscus(NLM).Methods Knee MRI imaging data of patients attending the outpatient clinic of the Department of Joint Surgery at the Affiliated Hospital of North China University of Technology from October 2018 to October 2020 were retrieved,and inclusion and exclusion criteria were strictly formulated,resulting in a total of 104 eligible patients.Among them,there were 32 cases in CDLM group,average age: 33.50(30.25,40.00),male/female: 15/17,left/right: 14:18.There were 30 cases in IDLM group,average age: 34.67(28.75,40.25),male/female: 18/12,left/right: 14:16.There were 42 cases in the NLM group,average age: 30.19(23.75,37.25),male/female: 23/19,left/right: 18:24.After determining that there were no significant differences in the comparison of the relevant baseline data among the three groups of patients(all P>0.05),the morphological quantifiers of the lateral femoral condyle and the local alignment index of the knee in the coronal plane were observed and measured in the MRI transaxial,coronal and sagittal planes in the three groups of patients and studied for comparison.Results 1(1)The values of anteroposterior diameter of the anterior femoral condyle(AL),anteroposterior diameter of the lateral femoral condyle(APL),anteroposterior diameter of the lateral femoral condyle/anteroposterior diameter of the medial femoral condyle(APL/APM)and posterior femoral condyle angle(PCA)in the transverse plane were statistically significant among the three groups(all P<0.05);(2)Comparison of measurements of the height of the lateral femoral condyle in the coronal plane(without cartilage: FG,with cartilage: FH),the lateral angle β of the distal femur(all P<0.05),the height of the meniscus in the weight-bearing area of the lateral joint space(HN)and the tangential angle ε of the tibial plateau(all P<0.001)between the three groups was statistically significant(all P<0.05);(3)The comparison of the values of anteroposterior femoral condyle diameter(with cartilage: APD)and anteroposterior femoral condyle diameter(without cartilage: APE)in the sagittal plane between the three groups was statistically significant(all P<0.05).2 The LSD-t test was used to compare the statistically significant values between the three groups:(1)AL values(P<0.05),HN values and angular ε values were statistically significant between the CDLM or IDLM and NLM groups(P<0.001);(2)PCA,FG,FH,APD and APE values were statistically significant between the CDLM and IDLM or NLM groups(all P<0.05);(3)APL values,APL/APM values and β values were statistically significant only in the comparison between the CDLM and NLM groups(all P<0.05).No statistical significance was found for each of the remaining morphological and local alignment indicators in the three groups.Conclusions 1 The values of AL,APL,APL/APM,PCA,FG,FH,angular ε,HN,APD values and APE on MRI of the knee are valuable in assessing the morphological changes of the lateral femoral condyle in adult patients with lateral discoid meniscus and help clinicians to predict the extent of meniscal resection preoperatively.2 Complete lateral disc meniscus is important to compensate for the developmental defect of the lateral femoral condyle and to maintain the local alignment of the knee,and meniscectomy should be used with caution in clinical practice.Figure 6;Table 5;Reference 110... |
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