Abstract:Objective To analyze the subjective and objective clinical outcomes of patients with mild residual rotational instability after anterior cruciate ligament (ACL) reconstruction in short-medium term,and summarize the affection of mild residual rotational instability on clinical outcomes.Methods A follow-up database regarding patients undergoing ACL reconstruction in National Institute of Sports Medicine from January 2015 to January 2018 were retrospectively reviewed.The follow-up time was 2~5 years,the mean follow-up was (31.3±7.6)months.Based on the results of pivot shift test in the last follow-up,a total of 22 patients with grade 1 pivot shift test were included in the residual rotational instability group,24 patients with negative pivot shift test were included in the stability group.The differences of MRI signal intensity and subjective scores (IKDC subjective score,Lysholm score,Tegner score) before and after operation were compared between the two groups.The correlation between subjective scores and signal intensity of grafts was statistically analyzed.Results MRI signal intensity of the stability group was significantly better than residual rotational instability group.The IKDC subjective score,Lysholm score and Tegner score of the two groups were significantly improved more than 2 years after operation,but there was no significant difference between the two groups in the postoperation.There was no correlation between subjective scores and signal intensity of graft.Conclusion Mild residual rotational instability after ACL reconstruction will not affect the clinical outcomes of patients in short-medium term,but it will lead to the increase of signal intensity of graft on MRI,which may affect ACL graft healing.
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