title: Midflexion Laxity After Implantation Was Influenced by the Joint Gap Balance Before Implantation in TKA.
abstract: The relationship between the joint gap before and after implantation in 259 knees during the total knee arthroplasty was investigated using a tensor device which can attach the polyethylene insert trial. Patients were divided into following 3 groups according to the joint gap balance before implantation (flexion joint gap--extension joint gap); group 1: >1mm; group 2: -1 to 1mm, and group 3: <-1mm. Joint gap after implantation was loose at 30°, 60°, 90°, and 120° of flexion in group 1 and 2, but loose only at 30° of flexion in group 3 (p<0.01). This study showed that loose flexion joint gap before implantation increased the risk of joint gap laxity after implantation especially at midflexion ranges.
authors.affiliation: Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, Abeno-ku Osaka, Japan.
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Minoda
authors.affiliation: Department of Orthopaedic Surgery, Osaka Rosai Hospital, Sakai Osaka, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Nakagawa
authors.affiliation: Department of Orthopaedic Surgery, Osaka General Hospital, Sumiyoshi-ku Osaka, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Sugama
authors.affiliation: Hanwa Joint Reconstruction Center, Sakai Osaka, Japan.
authors.forename: Tessyu
authors.initials: T
authors.lastname: Ikawa
authors.affiliation: Department of Orthopaedic Surgery, Shinbeppu Hospital, Beppu Oita, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Noguchi
authors.affiliation: Department of Orthopaedic Surgery, Oita University Faculty of Medicine Graduate School of Medicine, Yufu Oita, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Hirakawa
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D001696:Biomechanical Phenomena; D015331:Cohort Studies; D004867:Equipment Design; D005260:Female; D006801:Humans; D007432:Intraoperative Period; D007593:Joint Instability / Q000601:surgery*; D007719:Knee Joint / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011095:Polyethylenes; D016059:Range of Motion, Articular
chemical_list: D011095:Polyethylenes
keywords: joint gap after implantation; joint gap before implantation; midflexion laxity; tensor device; total knee arthroplasty