title: Double-bundle "anatomic" anterior cruciate ligament reconstruction: a cadaveric study of tunnel positioning with a transtibial technique.
abstract: OBJECTIVE
  The aim of this study was to examine whether a double-bundle anterior cruciate ligament (ACL) reconstruction with a transtibial approach could position the tibial and femoral tunnels accurately in the native bundle attachments.
  
  
  METHODS
  In 21 fresh-frozen knees the tibial and femoral attachments of the anteromedial (AM) and posterolateral (PL) bundles were outlined. The AM tibial tunnel guidewire was drilled with the 65 degree Howell tibial guide (Arthrotek, Warsaw, IN) located against the femur in the extended knee. The PL tibial wire was drilled through a prototype attachment to the Howell guide. Of the knees, 14 were available for the femoral part of the study. The AM femoral guidewire used an aimer offset 3 mm from the over-the-top position. The PL wire was drilled transtibially at 70 degrees of flexion, with external rotation and posterior drawer loads being applied. The plateaus and condyles were photographed and the wire positions measured.
  
  
  RESULTS
  With regard to the tibia, 17 of 21 AM wires were in the AM bundle attachment (at 61% and 36% of the natural ACL posteroanterior and mediolateral length, respectively) and 19 of 21 PL wires were in the PL bundle attachment (at 28% and 36% of the posteroanterior and mediolateral length, respectively). With regard to the femur, 12 of 14 AM wires and 9 of 14 PL wires were in the correct native bundle attachment. The AM wire was 3% more shallow than the center of the AM attachment (P = .03) and 6% more superior (P < .001), where 100% was the diameter of the posterior lateral condyle. The PL wire was 4% more shallow than the center of the PL attachment (P = .026) and 6% more superior (P < .001).
  
  
  CONCLUSIONS
  Anatomic and reproducible tibial guidewire positioning was achieved. Femoral wires were reproducibly positioned, but both were superior to and more shallow than the natural ACL bundle attachments, so further development or a different approach is appropriate.
  
  
  CONCLUSIONS
  The double-bundle reconstruction aims to restore anterior drawer and rotational stability. This technique ensures anatomic tibial positioning. Further improvements are needed with regard to the femur.
authors.affiliation: First Orthopaedic Clinic, University of Florence, Florence, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Giron
authors.forename: Pierluigi
authors.initials: P
authors.lastname: Cuomo
authors.forename: Andrew
authors.initials: A
authors.lastname: Edwards
authors.forename: Anthony M J
authors.initials: AM
authors.lastname: Bull
authors.forename: Andrew A
authors.initials: AA
authors.lastname: Amis
authors.forename: Paolo
authors.initials: P
authors.lastname: Aglietti
mesh_terms: D016118:Anterior Cruciate Ligament / Q000033:anatomy & histology* / Q000601:surgery; D001864:Bone Wires; D002102:Cadaver; D004210:Dissection / Q000379:methods; D005269:Femur / Q000033:anatomy & histology* / Q000601:surgery; D006801:Humans; D007719:Knee Joint / Q000033:anatomy & histology / Q000601:surgery; D013977:Tibia / Q000033:anatomy & histology* / Q000601:surgery