Clinical Follow-up And Prognosis Analysis Of Deep Knee Flexion Dysfunction After Anterior Cruciate Ligament Reconstruction

Objective: To investigate the correlation between preoperative and postoperative indicators of anterior cruciate ligament injury and postoperative deep flexion dysfunction after anterior cruciate ligament reconstruction.Methods: This project is a retrospective study,the laboratory and radiological information of patients who underwent arthroscopic anterior cruciate ligament reconstruction between July 2015 and July 2016 were collected using the hospital information system at the authors' institution.The outpatient follow-up data was collected(6 weeks,12 weeks,6 months)regarding the state of rehabilitation,knee range of motion,Visual analogue scale score and the Lysholm scale.Results: The analysis of preoperative MRI revealed no expected correlation between the extent of bone marrow edema and reduced knee joint mobility or Lysholm score,only the areas of tibia's bone marrow edema shows statistical significance(P < 0.05).The neutrophil-lymphocyte ratio was significantly higher for patients in the deep flexion dysfunction group,compared with the normal knee flexion group(P < 0.05).The ROC curve analysis showed that NLR>1.87 is the cut-off threshold indicating a high risk of poor deep flexion function(sensitivity 52.6%,specificity 99%).Conclusion: This study indicated that patients with high areas of tibia bone marrow edema and high preoperative NLR are at higher risk of developing poor postoperative deep flexion function.