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1、Anatomy:AM and PL Bundles,Anterior Medial Bundle,Controls anterior translation of tibia.Relatively taut throughout knee motion,maximum between 45-60 degrees.,Posterolateral Bundle,Controls Rotatory stability of knee.Taut in extension,between 0-15 degrees.,MRI Images:AM&PL,Arthroscopic View:AM&PL,Why
2、 Do Double Bundle?,*Between 10%and 30%of patients complain of pain and residual instability following Single-Bundle ACL reconstruction.*Arthritis has been observed on x-rays in up to 90%of patients at long-term follow-up after Single-Bundle ACL reconstruction.,Why do Double Bundle?,Single-Bundle ACL
3、 reconstruction does not adequately restore normal knee stability,particularly tibial rotation.Double-Bundle reconstruction better restores knee stability.,Fu:Evolution of the Door,Incisions for Double Bundle,Three arthroscopic incisions ALAnterolateral Portal AMAnteromedial Portal ACAccessory Porta
4、l,Tunnels for Double Bundle,Graft Placement:Double Bundle,MRI of Double Bundle Reconstruction,MRI:AM Bundle Reconstructed,MRI:PL Bundle Reconstructed,Outcome of Single-bundle Versus Double-bundle Reconstruction of the Anterior Cruciate LigamentA Meta-analysis,Richard B.Meredick,MD*,Kennan J.Vance,DO
5、*,David Appleby,MPH and James H.Lubowitz,MD*,The American Journal of Sports Medicine 36:1414-1421(2008),Outcome of Single-bundle Versus Double-bundle Reconstruction of the Anterior Cruciate LigamentA Meta-analysis,Conclusion:Double-bundle reconstruction does not result in clinically significant diff
6、erences in KT-1000 arthrometer or pivot-shift testing.,Why Not to Do Double Bundle ACL Reconstruction?,A few studies have shown an increased incidence of pivot shift after double bundle reconstruction.(Columbet et al 2006;Munet et al 2006)More vertical placement of the AM femoral tunnel and medial p
7、lacement of the AM tibial tunnel may lead to PCL impingement and instability with pivot shift.(Howell,Roundtable Discussion,Ortho Today,2008),Howell:Move Femoral Tunnel Laterally to Avoid PCL Impingement(Single Bundle),Summary,Double Bundle Reconstruction appears to have some promising results for the right indications and done with proper technique.There is still debate and no real conclusion on whether either technique is better.Refining technique with single bundle reconstruction may improve results as well without the increased risk of a more technically challenging procedure.,
