title: Knee kinematics in anterior cruciate ligament-substituting arthroplasty with or without the posterior cruciate ligament.
abstract: Few studies have compared functional kinematics in knees using identical prostheses with or without the posterior cruciate ligament (PCL). This study contrasted in vivo knee kinematics with an anterior cruciate ligament-substituting arthroplasty with and without PCL retention. We hypothesized that knees without PCLs would exhibit less femoral posterior translation, and consequently less maximum knee flexion. Fifty-six knees were studied using dynamic radiography at least one year post-surgery, with twenty-seven knees retaining the PCL and twenty-nine knees having the PCL sacrificed. Consistent with our hypothesis, PCL-sacrificing knees showed more anterior femoral condylar positions. Contrary to our hypothesis, PCL-sacrificing knees demonstrated greater knee flexion during kneeling (122° versus 115°). Contracted PCLs in severely deformed knees likely were the cause of limited flexion in some retaining knees.
authors.affiliation: Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida, USA.
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Watanabe
authors.forename: Masafumi
authors.initials: M
authors.lastname: Ishizuki
authors.forename: Takeshi
authors.initials: T
authors.lastname: Muneta
authors.forename: Scott A
authors.initials: SA
authors.lastname: Banks
mesh_terms: D000368:Aged; D016118:Anterior Cruciate Ligament / Q000601:surgery*; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D016119:Posterior Cruciate Ligament / Q000601:surgery*; D011446:Prospective Studies; D016059:Range of Motion, Articular