Knee Surg Sports Traumatol Arthrosc (2015) 23:1741–1747 DOI 10.1007/s00167-015-3572-1

KNEE

Factors affecting intraoperative kinematic patterns and flexion angles in navigated total knee arthroplasty Kazunari Ishida1 · Nao Shibanuma1 · Tomoyuki Matsumoto2 · Hiroshi Sasaki1 · Koji Takayama2 · Akihiko Toda1 · Ryosuke Kuroda2 · Masahiro Kurosaka2 

Received: 4 December 2014 / Accepted: 4 March 2015 / Published online: 13 March 2015 © European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2015

Abstract  Purpose  To investigate the factors affecting intraoperative kinematics, as measured with a navigation system, and their effect on maximum flexion angles during total knee arthroplasty (TKA). Method  One hundred posterior stabilised (PS) TKAs performed using an image-free navigation system were evaluated. Tibial internal rotation angles at maximum extension, 30°, 45°, 60°, 90°, and maximum flexion were collected at registration and after implantation. The varus angles from the coronal mechanical axis were also collected. The rotational patterns were divided into four groups to investigate whether flexion contracture and varus deformity affected the kinematic patterns, and correlated with the maximum pre- and post-operative flexion angles. Results  At registration, the flexion angles at maximum extension differed significantly between the kinematic groups; the flexion angle at maximum extension at registration was negatively correlated with the pre-operative maximum flexion angle (R2  = 0.226, p 

Factors affecting intraoperative kinematic patterns and flexion angles in navigated total knee arthroplasty.

To investigate the factors affecting intraoperative kinematics, as measured with a navigation system, and their effect on maximum flexion angles durin...
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