Effect of various factors on pull out strength of pedicle screw in normal and osteoporotic cancellous bone models
V Varghese, GS Kumar, V Krishnan - Medical Engineering & Physics, 2017 - Elsevier
Pedicle screws are widely used for the treatment of spinal instability by spine fusion. Screw
loosening is a major problem of spine fusion, contributing to delayed patient recovery. The
present study aimed to understand the factor and interaction effects of density, insertion
depth and insertion angle on pedicle screw pull out strength and insertion torque. A pull out
study was carried out on rigid polyurethane foam blocks representing osteoporotic to normal
bone densities according to the ASTM-1839 standard. It was found that density contributes …
loosening is a major problem of spine fusion, contributing to delayed patient recovery. The
present study aimed to understand the factor and interaction effects of density, insertion
depth and insertion angle on pedicle screw pull out strength and insertion torque. A pull out
study was carried out on rigid polyurethane foam blocks representing osteoporotic to normal
bone densities according to the ASTM-1839 standard. It was found that density contributes …
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