title: Influence of intra-operative joint gap on post-operative flexion angle in osteoarthritis patients undergoing posterior-stabilized total knee arthroplasty.
abstract: Recently, we developed a new tensor for total knee arthroplasty (TKA) procedures enabling soft tissue balance assessment throughout the range of motion while reproducing post-operative joint alignment with the patello-femoral (PF) joint reduced and the tibiofemoral joint aligned. Using the tensor with a computer-assisted navigation system, we investigated the relationship between various intra-operative joint gap values and their post-operative flexion angles. An increased value during the extension to flexion gap and a decreased value during the flexion to deep flexion gap with PF joint reduced, not everted, showed an inverse correlation with post-operative knee flexion angle, not pre-operative flexion angle. In conclusion, understanding the characteristics of joint gap kinematics in posterior-stabilized TKA under physiological and reproducible joint conditions may enable the prediction of the post-operative flexion angle and help to determine the appropriate intra-operative joint gap.
authors: Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan. matsun@m4.dion.ne.jp
authors: Tomoyuki
authors: T
authors: Matsumoto
authors: Kiyonori
authors: K
authors: Mizuno
authors: Hirotsugu
authors: H
authors: Muratsu
authors: Nobuhiro
authors: N
authors: Tsumura
authors: Naomasa
authors: N
authors: Fukase
authors: Seiji
authors: S
authors: Kubo
authors: Shinichi
authors: S
authors: Yoshiya
authors: Masahiro
authors: M
authors: Kurosaka
authors: Ryosuke
authors: R
authors: Kuroda
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods; D005240:Feasibility Studies; D005260:Female; D005269:Femur / Q000601:surgery; D005500:Follow-Up Studies; D006801:Humans; D007595:Joint Prosthesis; D007719:Knee Joint / Q000503:physiopathology*; D016343:Monitoring, Intraoperative; D009068:Movement; D020370:Osteoarthritis, Knee / Q000601:surgery*; D010027:Osteotomy / Q000379:methods; D010329:Patella / Q000601:surgery; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology*; D015203:Reproducibility of Results; D012399:Rotation; D025321:Surgery, Computer-Assisted; D013977:Tibia / Q000601:surgery; D016896:Treatment Outcome