A Comparative Study Of MRI And Arthroscopy Of Knee Meniscus And Articular Cartilage Injury

Objective:By analyzing the characteristics of magnetic resonance of knee meniscus and articular cartilage injury and comparing the MRI characteristics with the characteristics of arthroscopic surgery,we evaluate the value of MRI to diagnose knee meniscus and articular cartilage injury,so we can provide a reliable imaging basis for clinical to evaluate the severity of knee joint injury.Methods:We collected patients who had the examinations of the MRI and arthroscopy of knee retrospectively from January to December in 2017.There were 51 cases,including 20 males and 31 females.The age ranged from 50 to 60 years old.All patients felt painful and had no history of obvious trauma with knee,so they came to hospital four treatment.MRI had been performed by routine scan sequences.of knee in our hospital,and arthroscopy surgery were performed 1-2 weeks after MRI.The radiodiagnostic physician needed to recorded meniscus articular cartilage injury,and grad the meniscus and articular cartilage damage,and then compared it with the results of arthroscopy.The arthroscopic diagnosis is used as the gold standard to calculate the total sensitivity,specificity,accuracy of MRI in the diagnosis of meniscus and articular cartilage injury.The sensitivity,specificity and accuracy of MRI in diagnosis of articular cartilage 1/2/3 grade injury are calculated.Last discuss and analyze the reasons of false positive and false negative.Result: The arthroscopic diagnosis results are the gold standard.The sensitivity of MRI diagnosis of meniscus tear is 90%,the specificity is 88.5%,and the accuracy is 89.2%.The routine MRI sequences have a higher ability to diagnose meniscus tear and the injury of articular cartilage.The total sensitivity of the diagnosis of articular cartilage injury is 92.9%,the specificity is 81.9%,and the accuracy is 89.5%.The sensitivity,specificity and accuracy of MRI of the diagnosis of articular cartilage grades 1,2 and 3 injury is that grade 1 is 46.7%,97.2%.,94.7%,grade 2 is 85.9%,82.3%,84.0%,grade 3 is 72.7%,96.8%,92.4%,so MRI has high ability of diagnosing of articular cartilage injury,but poor detection ability for lower level articular injury,In addition,MRI found 1 case of osteochondritis dissecans and all patients have subchondral bone marrow abnormalities in different locations,so MRI has its unique advantages in observing subchondral lesions.Conclusion: routine MRI sequences have high value for diagnosing meniscus and articular cartilage injury,and have high sensitivity,specificity and accuracy for diagnosing injury.However,the ability to detect lower-grade articular cartilage injury is poor.MRI has unique advantages in the observation of subchondral bone lesions.It can be used as a tool for preoperative filting of knee joint lesions.Through MRI multiple sequences,multi-parameter and multi-directional display of the location,extent and degree of injury,it can guide clinicians to obtaining reasonable application during arthroscopic surgery.