【Objective】 This study aimed to investigate the value of MRI to evaluate knee stability after anterior cruciate ligament reconstruction.【Methods】 Clinical and MRI study were performed on 158 eligible patients with anterior cruciate ligament reconstruction

bone tunnel

graft and internal fixation device MR imaging were analyzed and compared with knee stability results by clinical examination. According to results of clinical examination

26 cases were diagnosed instability (positive group) and 132 cases were stability (negative group). The changes of the tibial and femoral tunnel diameter

differences of positive rate in bone tunnel position

graft and internal fixation between two groups were compared. Kappa test for consistency between clinical examination and MR performance in bone tunnel position

graft and internal fixation. Sensitivity

specificity

accuracy

positive and negative predictive values were calculated for MRI diagnosing knee joint instability. 【Results】 Inner diameter changes of the tibial and femoral tunnel in group instability were greater than group stability

the difference was statistically significant (P < 0.01). There was a higher positive rate in positive group than negative group with MR sign of bone tunnel position

graft performance and internal fixation (P < 0.001)

Kappa value was 0.599

0.744

0.285

respectively

P < 0.001

statistical differences between the two groups.【Conclusions】 There was certain value of MRI in assessing knee stability after anterior cruciate ligament reconstruction

which may provide valuable information for clinical post-operation follow up and second operation.