title: Femoral component sizing in total knee arthroplasty: size matched resection versus flexion space balancing.
abstract: Generally, 2 different methods are used to select femoral size. These can be termed "size-matched resection" and "flexion-space balancing." The purpose of this paper is to compare these 2 methods during 50 sequential total knee arthroplasty surgeries. The flexion-space-balancing method led to a smaller size selection than the size-matched-resection method in 28 (56%) knees. In the remaining 22 knees, the measurement methods led to the selection of the same size femoral component. The difference in measurement methods was significant (P<.05). The preoperative varus knees were more sensitive to the differences in measurement methods than the valgus knees (P<.05). A flexion space that is too small may adversely affect the clinical outcome of knee arthroplasty.
authors.affiliation: McClure Musculoskeletal Research Center, Department of Orthopaedics and Rehabilitation, University of Vermont, Burlington 05405-0084, USA.
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Incavo
authors.forename: Kathryn M
authors.initials: KM
authors.lastname: Coughlin
authors.forename: Bruce D
authors.initials: BD
authors.lastname: Beynnon
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D016009:Chi-Square Distribution; D005269:Femur / Q000033:anatomy & histology*; D006801:Humans; D007720:Knee Prosthesis; D020370:Osteoarthritis, Knee / Q000601:surgery; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D012399:Rotation; D016896:Treatment Outcome