The Role Of MRI Mean Signal Intensity Values In Quantitative Evaluation Of Meniscal Statement After Arthroscopic Meniscus Repair

Objective: To investigate the role of MRI mean signal intensity(M)in the evaluation of meniscus healing after meniscus suture repair.Methods:1.In the normal group,10 healthy volunteers(5 males and 5 females,aged 15-40,without knee pain,trauma,disease,degeneration,etc.)were selected to receive 1.5T MRI(Siemens,Magnetom Assenza)examination of both knee joints.A total of 40 meniscus images(20 images of both medial and lateral meniscus)were obtained.The MRI signal values corresponding to the body and posterior Angle of the medial and lateral meniscus were measured on the PDWI images.2.Forty-two patients(22 males and 20 females)who received arthroscopic meniscus suture in our hospital from October 2018 to June 2020 were selected,aged 16-40 years old,with an average follow-up of 12 months.According to Barrett’s standard,they were divided into clinical healing group and clinical unhealed group,and the contralateral uninjured meniscus was used as the control group.Preoperative and postoperative MRI signal values of the torn meniscus(injury group)and the corresponding parts of the contralateral uninjured meniscus were measured respectively.Comparison respectively: 1.Mean signal values of posterior horn of meniscus in normal group and male and female.2.Mean preoperative and postoperative MRI signal values of the clinically healed group and the clinically unhealed group;3.Average postoperative signal values of the clinical healing group,the clinical unhealed group,the control group and the normal group;4.Compare the injury and clinical healing group average MRI signal intensity value difference(Δ M)and injury group and clinical MRI signal intensity values to form not difference(Δ M1);5.Reliability analysis of measurement data;6.Lyshlom scores were performed preoperatively and postoperatively in 30 patients.Results:1.There was no significant difference in the signal values of posterior Angle of the meniscus between male and female in normal group2.The clinical healing group was statistically significant compared with the injury group(P<0.05).There was no statistically significant difference between the clinical unhealed group and the injury group(P>0.05).3.There was no statistical significance between the clinical healing group and the normal group(P>0.05);There was no statistically significant difference between the clinical healing group and the control group(P>0.05);There was statistical significance between the unhealed group and the normal group(P<0.05);There was statistical significance between the unhealed group and the control group(P<0.05)4.The average damage and clinical healing group MRI signal intensity value difference(ΔM)was 172.56 ± 53.75;Injury group and clinical with average to form MRI signal strength value difference(ΔM1)was 87.50 ±57.95;ΔM compared with ΔM1(P<0.05)5.Intraclass Correlation Coefficient(ICC)was used to measure data reliability,ICC=0.89;6.Lyshlom preoperative score increased from 46.4±4.2points to 86.4±7.86 points(P=0.000).Conclusions: MRI mean signal intensity is a reliable indicator to quantitatively evaluate the clinical healing of meniscus after arthroscopic meniscus suture.