title: Sagittal flexion of the femoral component affects flexion gap and sizing in total knee arthroplasty.
abstract: The purpose of this study was to determine how much sagittal rotation of the femoral component affects the flexion gap and femoral component sizing using a computer-simulation technique. The study comprised 25 knees scheduled for total knee arthroplasty (TKA). The femoral component was positioned at -2°, 0°, 2°, 4°, or 6° of flexion to the anterior femoral cortex, and the resected portion of the posterior medial femoral condyle was measured for 3 total knee systems. The amount of the resected bone of the posterior medial condyle decreased approximately 1 mm for every 2° of additional flexion in all TKA systems. Intentional sagittal flexion of the femoral component by several degrees during TKA can be a useful downsizing technique for the femoral component without excessively increasing the flexion gap.
authors.affiliation: Department of Orthopaedic Surgery, Chiba Rehabilitation Center, 1-45-2 Hondacho, Midori-ku, Chiba, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Tsukeoka
authors.forename: Tae Hyun
authors.initials: TH
authors.lastname: Lee
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000379:methods; D001696:Biomechanical Phenomena; D017760:Bone Malalignment / Q000000981:diagnostic imaging / Q000517:prevention & control; D003198:Computer Simulation; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging* / Q000502:physiology* / Q000601:surgery; D007720:Knee Prosthesis; D008297:Male; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology*; D012189:Retrospective Studies; D012399:Rotation; D012984:Software; D014057:Tomography, X-Ray Computed