DOS 2018

242 · DOS Abstracts Outcome after isolated medial collateral ligament (MCL) reconstruction and combined MCL+ anterior cruciate ligament (ACL) reconstruction. Results from the Danish Knee Ligament Reconstruction (DKRR) Martin Lind, Torsten Grønbeck Nielsen, Kevin Jacobsen Orthopedics, Aarhus University Hospital Background: MCL lesions normally heal non-operatively but grade 3 lesions can result in chronic valgus instability, which needs surgical treatment with MCL reconstruction. Outcome data after MCL reconstruction are limited represented by small sized case studies. Purpose / Aim of Study: The aim of this study is to present objective knee stability and subjective outcome in patients after isolated MCL reconstruction and combined MCL+ACL reconstruction and compare these with outcomes from isolated ACL reconstruction based on results from DKRR. We hypothesized improved valgus stability and subjective outcome after MCL reconstruction. Materials and Methods: Respectively 103, 495 and 24.683 of isolated MCL, combined MCL+ACL and isolated ACL reconstructions were registered in the (DKRR) between 2005 and 2016. Objective outcomes of valgus and sagittal knee laxity and patient-reported outcome (KOOS) at one-year follow-up was used to compare the outcome of the 3 cohorts. Findings / Results: Medial stability improved significantly from pre- to post- operatively for both isolated a MCL and combined MCL+ACL reconstruction with 53 and 69 % having normal valgus stability (0-2 mm laxity) respectively. MCL+ACL reconstruction obtained similar sagittal stability as isolated ACL re- constructions of 1,7 and 1,5 mm respectively. KOOS outcome demonstrated that both isolated MCL and combined MCL+ACL reconstruction improved sig- nificantly to similar score levels from pre- op to one-year but scores were lower than isolated ACL reconstructions. Conclusions: Both isolated MCL and combined MCL+ACL reconstruction ob- tained improved subjective outcomes and valgus stability with a high percent- age of normalized stability. But with poorer subjective outcome than isolated ACL reconstructions. Combined MCL+ACL reconstructions had similar sagittal stability as isolated ACL reconstructions. 183.