title: In vivo gap analysis in various knee flexion angles during navigation-assisted total knee arthroplasty.
abstract: Achieving rectangular flexion and extension gaps is important during gap balancing technique in total knee arthroplasty (TKA). However, assessment of gaps throughout the range of knee motion is obscure. One hundred knees operated by TKA using a navigation-assisted gap balancing technique were evaluated. Intraoperatively, after achieving rectangular flexion and extension gaps, mediolateral gaps in each flexion angle (0°, 45°, 90°, 120°) were recorded. Patients were divided into 4 groups; Group I: no gap difference (n = 64), Group II: lax in midflexion (n = 20), Group III: lax in deep flexion (n = 8) and Group IV: lax in both midflexion and deep flexion (n = 8). This study demonstrated that significant proportion (36%) of TKA cases had laxity in midflexion (45°) even when rectangular extension (0°)-flexion (90°) gap was achieved.
authors.affiliation: Department of Orthopedic Surgery, Veterans Health Service Medical Center, Seoul, South Korea.
authors.forename: Jung-Ro
authors.initials: JR
authors.lastname: Yoon
authors.forename: Hyeon-Il
authors.initials: HI
authors.lastname: Jeong
authors.forename: Kwang-Jun
authors.initials: KJ
authors.lastname: Oh
authors.forename: Jae-Hyuk
authors.initials: JH
authors.lastname: Yang
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D006801:Humans; D007432:Intraoperative Period; D007593:Joint Instability / Q000517:prevention & control* / Q000601:surgery; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery; D008297:Male; D020370:Osteoarthritis, Knee / Q000503:physiopathology* / Q000601:surgery*; D016059:Range of Motion, Articular; D025321:Surgery, Computer-Assisted
keywords: deep flexion; gap technique; midflexion; navigation; total knee arthroplasty