title: Kinematic analysis of conventional and high-flexion cruciate-retaining total knee arthroplasties: an in vitro investigation.
abstract: This study examined the kinematics of a cruciate-retaining (CR) total knee arthroplasty (TKA) component that attempts to enhance knee flexion by improving posterior tibiofemoral articular contact at high-flexion angles. Using an in vitro robotic experimental setup, medial and lateral femoral translations of this CR design were compared with that of a conventional CR TKA design and intact knee under a combined quadriceps and hamstring muscle load. Both CR TKA designs showed similar kinematics throughout the range of flexion (0 degrees -150 degrees ). The TKAs restored nearly 80% of the posterior femoral translation of the intact knee at 150 degrees . The posterior cruciate ligament (PCL) forces measured for the high-flexion CR TKA component indicate that the PCL is important in the mid-flexion range but has little effect on knee kinematics at high flexion.
authors.affiliation: Bioengineering Laboratory, Department of Orthopaedic Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA.
authors.forename: Ephrat
authors.initials: E
authors.lastname: Most
authors.forename: Guoan
authors.initials: G
authors.lastname: Li
authors.forename: Peter G
authors.initials: PG
authors.lastname: Sultan
authors.forename: Sang Eun
authors.initials: SE
authors.lastname: Park
authors.forename: Harry E
authors.initials: HE
authors.lastname: Rubash
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D016119:Posterior Cruciate Ligament / Q000502:physiology*; D011474:Prosthesis Design; D012371:Robotics