In-Vivo knee kinematics in rotationally unconstrained total knee arthroplasty

Fabio Catani, Claudio Belvedere, Andrea Ensini, Alessandro Feliciangeli, Sandro Giannini, Alberto Leardini

Research output: Contribution to journalArticlepeer-review


Total knee replacement designs claim characteristic kinematic performance that is rarely assessed in patients. In the present study, in vivo kinematics of a new prosthesis design was measured during activities of daily living. This design is posterior stabilized for which spine-cam interaction coordinates free axial rotation throughout the flexion-extension arc by means of a single radius of curvature for the femoral condyles in the sagittal and frontal planes. Fifteen knees were implanted with this prosthesis, and 3D video-fluoroscopic analysis was performed at 6-month follow-up for three motor tasks. The average range of flexion was 70.1° (range: 60.1-80.2°) during stair-climbing, 74.7° (64.6-84.8°) during chair-rising, and 64.1° (52.9-74.3°) during step-up. The corresponding average rotation on the tibial base-plate of the lines between the medial and lateral contact points was 9.4° (4.0-22.4°), 11.4° (4.6-22.7°), and 11.3° (5.1-18.0°), respectively. The pivot point for these lines was found mostly in the central area of the base-plate. Nearly physiological range of axial rotation can be achieved at the replaced knee during activities of daily living.

Original languageEnglish
Pages (from-to)1484-1490
Number of pages7
JournalJournal of Orthopaedic Research
Issue number10
Publication statusPublished - Oct 2011


  • knee kinematics
  • posterior stabilized total knee arthroplasty
  • video-fluoroscopy

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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