title: A new protocol from real joint motion data for wear simulation in total knee arthroplasty: stair climbing.
abstract: In its normal lifespan, a knee prosthesis must bear highly demanding loading conditions, going beyond the sole activity of level walking required by ISO standard 14243. We have developed a protocol for in vitro wear simulation of stair climbing on a displacement controlled knee simulator. The flexion/extension angle, intra/extra rotation angle, and antero/posterior translation were obtained in patients by three-dimensional video-fluoroscopy. Axial load data were collected by gait analysis. Kinematics and load data revealed a good consistence across patients, in spite of the different prosthesis size. The protocol was then implemented and tested on a displacement controlled knee wear simulator, showing an accurate reproduction of stair climbing waveforms with a relative error lower than 5%.
authors.affiliation: Medical Technology Laboratory, Istituto Ortopedico Rizzoli, Bologna, Italy.
authors.forename: Santina
authors.initials: S
authors.lastname: Battaglia
authors.affiliation: Movement Analysis Laboratory, Istituto Ortopedico Rizzoli, Bologna, Italy.
authors.forename: Claudio
authors.initials: C
authors.lastname: Belvedere
authors.affiliation: Medical Technology Laboratory, Istituto Ortopedico Rizzoli, Bologna, Italy.
authors.forename: Sami Abdel
authors.initials: SA
authors.lastname: Jaber
authors.affiliation: Medical Technology Laboratory, Istituto Ortopedico Rizzoli, Bologna, Italy. Electronic address: affatato@tecno.ior.it.
authors.forename: Saverio
authors.initials: S
authors.lastname: Affatato
authors.affiliation: Movement Analysis Laboratory, Istituto Ortopedico Rizzoli, Bologna, Italy.
authors.forename: Valentina
authors.initials: V
authors.lastname: D'Angeli
authors.affiliation: Movement Analysis Laboratory, Istituto Ortopedico Rizzoli, Bologna, Italy.
authors.forename: Alberto
authors.initials: A
authors.lastname: Leardini
mesh_terms: D000203:Activities of Daily Living; D019645:Arthroplasty, Replacement, Knee; D001696:Biomechanical Phenomena; D003198:Computer Simulation; D019544:Equipment Failure Analysis / Q000379:methods*; D005471:Fluoroscopy; D005500:Follow-Up Studies; D006801:Humans; D021621:Imaging, Three-Dimensional; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery; D007720:Knee Prosthesis; D008124:Locomotion / Q000502:physiology*; D008954:Models, Biological; D011474:Prosthesis Design; D014741:Video Recording
keywords: Daily activity; Gait analyses; Stair climbing; Total knee arthroplasty; Wear simulation