title: Intercondylar roof impingement pressure after anterior cruciate ligament reconstruction in a porcine model.
abstract: Anterior cruciate ligament (ACL) graft impingement against the intercondylar roof has been postulated, but not thoroughly investigated. The roof impingement pressure changes with different tibial and femoral tunnel positions in ACL reconstruction. Anterior tibial translation is also affected by the tunnel positions of ACL reconstruction. The study design included a controlled laboratory study. In 15 pig knees, the impingement pressure between ACL and intercondylar roof was measured using pressure sensitive film before and after ACL single bundle reconstruction. ACL reconstructions were performed in each knee with two different tibial and femoral tunnel position combinations: (1) tibial antero-medial (AM) tunnel to femoral AM tunnel (AM to AM) and (2) tibial postero-lateral (PL) tunnel to femoral High-AM tunnel (PL to High-AM). Anterior tibial translation (ATT) was evaluated after each ACL reconstruction using robotic/universal force-moment sensor testing system. Neither the AM to AM nor the PL to High-AM ACL reconstruction groups showed significant difference when compared with intact ACL in roof impingement pressure. The AM to AM group had a significantly higher failure load than PL to High-AM group. This study showed how different tunnel placements affect the ACL-roof impingement pressure and anterior-posterior laxity in ACL reconstruction. Anatomical ACL reconstruction does not cause roof impingement and it has a biomechanical advantage in ATT when compared with non-anatomical ACL reconstructions in the pig knee. There is no intercondylar roof impingement after anatomical single bundle ACL reconstruction.
authors.affiliation: Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, 3471 Fifth avenue, 1010 Kaufmann Building, Pittsburgh, PA, USA.
authors.forename: Takanori
authors.initials: T
authors.lastname: Iriuchishima
authors.forename: Goro
authors.initials: G
authors.lastname: Tajima
authors.forename: Sheila J M
authors.initials: SJ
authors.lastname: Ingham
authors.forename: Wei
authors.initials: W
authors.lastname: Shen
authors.forename: Takashi
authors.initials: T
authors.lastname: Horaguchi
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Saito
authors.forename: Patrick
authors.initials: P
authors.lastname: Smolinski
authors.forename: Freddie H
authors.initials: FH
authors.lastname: Fu
mesh_terms: D000818:Animals; D016118:Anterior Cruciate Ligament / Q000503:physiopathology* / Q000601:surgery*; D000070598:Anterior Cruciate Ligament Injuries; D007593:Joint Instability / Q000209:etiology; D007719:Knee Joint / Q000502:physiology / Q000503:physiopathology* / Q000601:surgery*; D019637:Orthopedic Procedures / Q000009:adverse effects* / Q000379:methods; D017847:Patellar Ligament / Q000637:transplantation; D011312:Pressure; D013314:Stress, Mechanical; D034421:Sus scrofa; D014182:Transplantation, Autologous