Double-bundle non-anatomic ACL revision reconstruction with allograft resulted in a low revision rate at 10 years

Purpose This study aimed at reporting the long-term second revision rate and subjective clinical outcomes from a cohort of patients who underwent a double-bundle (DB) ACLR first revision with allograft at a single institution. Methods The Institutional database was searched according to the following inclusion criteria: (1) patients that underwent DB-ACL first revision with Achilles tendon allograft, (2) surgery performed between January 2000 and December 2012, (3) age at revision >= 18 y/o. Patients' general information, history, surgical data, and personal contacts were extracted from charts. An online survey platform was implemented to collect responses via email. The survey questions included: date of surgeries, surgical data, date of graft failure and subsequent second ACL revision surgery, any other surgery of the index knee, contralateral ACLR, KOOS score, and Tegner scores. Results Eighty-one patients were included in the survival analysis, mean age at revision 32 +/- 9.2 y/o, 71 males, mean BMI 24.7 +/- 2.7, mean time from ACL to revision 6.8 +/- 5.4 years, mean follow-up time 10.7 +/- 1.4 years. There were 12 (15%) second ACL revisions during the follow-up period, three females and nine males, at a mean of 4.5 +/- 3 years after the index surgery. The overall survival rates were 85% from a second ACL revision and 68% from all reoperations of the index knee. Considering only the successful procedures (61 patients), at final follow-up, the mean values for the KOOS subscales were 84 +/- 15.5 for Pain, 88.1 +/- 13.6 for Symptoms, 93 +/- 11.6 for ADL, 75 +/- 24.5 for Sport, and 71 +/- 19.6 for Qol. Twenty-nine (48%) patients performed sports activity at the same level as before ACLR failure. Conclusions Double-bundle ACL revision with fresh-frozen Achilles allograft yields satisfactory results at long-term follow-up, with an 85% survival rate from a second ACL revision at mean 10 years' follow-up and good patient-reported clinical scores.