Comparative Study of Diagnostic Effect of Dynamic Ultrasound and MRI on Anterior Cruciate Ligament Injury / 中国运动医学杂志

ABSTRACT

Objective To compare the value of dynamic ultrasound(US)and magnetic resonance imag-ing(MRI)in the diagnosis of anterior cruciate ligament(ACL)injury.Methods A total of 258 patients diagnosed with ACL knee injury between January 2019 and December 2022 at our hospital were select-ed.All patients underwent arthroscopy,followed by MRI and dynamic ultrasound(US)examinations,with the interval between the two examinations no more than 48 hours.Patients were grouped accord-ing to their injury severity(type Ⅰ oedema,type Ⅱ partial tear and type Ⅲ complete tear),injury stage(acute,≤2 weeks;subacute,2 weeks＜T≤2 months;chronic,＞2 months)and injury site(mid-,femo-ral,and tibial starting and ending tears).Then their diagnostic values of MRI and dynamic ultrasound examinations were compared using the arthroscopic results as the standard.Results A total of 258 pa-tients were included in this study.According to arthroscopic results,24 and 226 ones were diagnosed as type Ⅰ and type Ⅲ injuries,respectively,while the corresponding positive rates of MRI(100%and 99.1%)were higher than US(33.3%and 77.0%).Moreover,8 cases were diagnosed as type Ⅱ inju-ries based on the arthroscopic results.However,only 6 were correctly diagnosed by MRI with 2 misdi-agnosed as type Ⅰ injuries,while no cases were given correct diagnosis by US,with 6 and 2 misdiag-nosed as type Ⅲ and Ⅰ injuries.Out of the 234 patients arthroscopically confirmed ACL rupture,106 were in the acute phase,48 and 80 in the subacute and chronic phases.The diagnostic positive rates of MRI were 98.11%,100%,and 97.50%for patients in the acute,subacute and chronic phases,re-spectively,while the corresponding values of US were 60.38%,100%and 77.50%,respectively.More-over,the MRI diagnostic positive rate was 97.85%,100%,and 100%,while that of US was 78.49%,20.00%,and 85.71%for patients with arthroscopic femoral stop,mid-range and tibial stop tears,respectively.In patients with ACL injuries in the acute and chronic phases,as well as those with femoral stop and mid-range tears,the diagnostic positive rate of MRI was significantly higher than that of US(P＜0.05).For patients in the subacute stage,both tests had a 100%positive rate,without showing significant differences(P＞0.05).Conclusion US is superior to MRI in screening ACL injuries of different types and courses clinically,especially for those in the subacute stage.