The expansion behavior of human lumbar pedicle cortex
Küçük Resim Yok
Tarih
2006
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Society for Experimental Mechanics Inc.
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Pedicle screws are commonly used to provide support for a fractured spine during healing process. However, neither the microstructure of pedicle nor the maximum screw size that will not cause any fracture at the pedicle is clearly known. Four human lumbar vertebral specimens yielding eight pedicles were obtained. Two linear strain gauges were circumferentially affixed to the lateral and medial surfaces. 6.5×45mm and 7.5×40mm pedicle screws were sequentially placed into each pedicle and removed carefully. Lateral and medial cortices of several intact lumbar pedicles were sectioned and images of cortex cross-sections were analyzed under microscope. Deformations at the cortices produced during screw insertion could not be restored after removal although no visible fracture was detected. Strain levels producing plastic deformation in the pedicle cortex were different from those reported for femoral cortical bone. The image analyses showed that the pedicle cortex had an osteonal structure. However, no surrounding lamellar bone was observed at the periosteum. Our results suggested that screw insertion into the pedicle caused plastic deformation although the screws did not contact the cortex. The structure and mechanical properties of the pedicle cortex seemed to be different from those of other cortical bones in human body.
Açıklama
SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006 -- 4 June 2006 through 7 June 2006 -- Saint Louis, MO -- 68397
Anahtar Kelimeler
Fracture; Image Analysis; Microscopic Examination; Microstructure; Plastic Deformation; Strain; Strain Gages; Cortical Bones; Pedicle Cortex; Periosteum; Screw Size; Aluminum Alloys
Kaynak
Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
WoS Q Değeri
Scopus Q Değeri
N/A
Cilt
1
