Details

Autor(en) / Beteiligte

• Zhang, Jia
• Lu, William W
• Ye, Qi-bin
• Qiu, Gui-xing

Titel

Biomechanical evaluation of stiffness of long-segment instrumented spine

Ist Teil von

• Zhōngguó yīxué kēxuéyuàn xuébào, 2005-04, Vol.27 (2), p.153

Ort / Verlag

China

Erscheinungsjahr

2005

Quelle

MEDLINE

Beschreibungen/Notizen

• To test the changes of the stiffness of the intact, released, and instrumented spines in an in vitro porcine model. Twelve porcine spines (12 segments each) were harvested for the biomechanical tests with Material Test System. Stiffness during flexion, extension, lateral bending, and axial rotation were recorded; then the specimen was released with intervertebral discs and the facet joints removed, followed by repeating the biomechanical tests for stiffness; and finally, a double-rod titanium construct was applied for internal fixation to each released spine and stiffness tests were repeated again. Compared with the intact porcine spines [stiffness during flexion, extension, lateral bending, and axial rotation was 52.89 +/- 15.98, 105.43 +/- 56.38, 42.09 +/- 14.73, and (16.94 +/- 4.85) N x mm/degrees, respectively], the stiffness of the released porcine spines [stiffness during flexion, extension, lateral bending, and axial rotation was 44.04 +/- 13.73, 41.46 +/- 10.80, 31.75 +/- 7.23, and (9.10 +/- 2.07)N x