An Implantable Strain Measurement System Designed to Detect Spine Fusion

Abstract

The consistency obtained in torsional loading indicates that this type of loading will provide the most useful data from patients in vivo. Excellent bonebonding and accurate strain transmission using a long-term strain measurement system and miniature radio transmitter indicate that strains collected from patients with this system will be accurate.

Effect of screw position on load transfer in lumbar pedicle screws: a non-idealized finite element analysis

“…(Hongo, Abe, Shimada, Murai, Ishikawa and Sato 1999, Kayanja et al 2004, Kayanja et al 2005, Szivek et al 2002) Calculations of stress from strain recorded by a rosette strain gauge are less common in spinal biomechanics, but have been reported in a study involving the femur. (Shah, Bougherara, Schemitsch and Zdero 2012) Although the stresses calculated from strain in our in vitro study fell a bit outside the ranges of the stresses calculated by the finite element models during axial rotation, they were very near the mean values in two of the three directions of loading (Fig.…”

Direct in vivo strain measurements in human bone—A systematic literature review

“…They used an implantable monitoring system consisting of strain gages bonded to lamina and a radio telemetry unit. Prior to applying this implantable system in vivo, they tested it on cadaver spines in vitro (Szivek et al, 2002). Lamina strains were monitored during daily activities for seven months after the surgery while fusion was occurring.…”

Implantable MEMS compressive stress sensors: Design, fabrication and calibration with application to the disc annulus

“…In the spine, pressure sensors have been described for insertion into the disc nucleus in vivo (Buttermann et al, 2009;Guering et al, 2006;Nachemson and Morris, 1964;Nachemson and Elfstrom, 1970;Nachemson, 1981;Polga et al, 2004;Sato et al, 1999;Schultz et al, 1982;Wilke et al, 1999) and in vitro (Abe et al, 1998;Buttermann and Beaubien, 2008;Cripton et al, 2001;Cunningham et al, 1997;Dennison et al, 2008;Edwards et al, 2001;Moore et al, 2009;Nesson et al, 2008;Weinhoffer et al, 1995). In vivo spine measurements also include strain gauges on vertebral bone (Lanyon, 1972;Szivek et al, 2002;Szivek et al, 2005), and load cells inserted between vertebrae (Hauerstock et al, 2001;Ledet et al, 2000).…”