title: Influence of gap balance on the sagittal movement of a specific mobile bearing floating platform design in total knee arthroplasty.
abstract: We analyzed 119 knees implanted with mobile bearing floating platform prostheses using the navigation-assisted gap balancing technique to analyze the relationship between intraoperative sagittal movement of floating platforms and soft tissue balancing. The 95 (79.8%) knees were classified into the positive rollback group (mean insert posterior rollback 5.86 ± 1.24 mm), and the remaining 24 (20.2%) into the negative rollback group. Lateral flexion gap (LFG) differed significantly between knees with positive and negative rollback (20.5 ± 1.7 mm vs 22.1 ± 1.7 mm, P = .021). Only LFG significantly influenced the occurrence of bearing sagittal movement. Sagittal translation of the insert occurred in about 80% of knees implanted with mobile bearing floating platforms in TKA, and was affected by flexion gaps, especially on the lateral side.
authors.affiliation: Department of Orthopaedic Surgery, Korea University College of Medicine, Anam Hospital, Seoul, South Korea.
authors.forename: Dae-Hee
authors.initials: DH
authors.lastname: Lee
authors.forename: Dong-Ki
authors.initials: DK
authors.lastname: Lee
authors.forename: Young-Soo
authors.initials: YS
authors.lastname: Shin
authors.forename: Seung-Beom
authors.initials: SB
authors.lastname: Han
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007432:Intraoperative Period; D007720:Knee Prosthesis; D008297:Male; D020370:Osteoarthritis, Knee / Q000601:surgery*; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D025321:Surgery, Computer-Assisted
keywords: gap balancing; mobile bearing; sagittal movement; total knee arthroplasty