Enhancement of pedicle screw stability using calcium phosphatecement in osteoporotic vertebrae: in vivo biomechanical study

Taniwaki, Yoshimichi; Takemasa, Ryuichi; Tani, Tohru; Mizobuchi, Hiroo; Yamamoto, Hiroshi

doi:10.1007/s10776-003-0639-6

Cited by 52 publications

(42 citation statements)

References 21 publications

(16 reference statements)

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“…The material in bone model failed primarily in the shearing of a thin region the size of outer diameter of the screw as observed in studies on synthetic, human, and animal bones [61][62][63] . The different design factors that effect the pullout strength of pedicle screws can be classified as by screw parameters, such as thread type [27,52,64] , outer diameter [9] , and inner diameter or by insertion technique, such as the effect of size of pilot holes [65] , tapping [66] , and insertion angle [23] , or by augmentation technique such as polymethylmethacrylate(PMMA) [16] , or calcium phosphate (CaP) [67] . A detailed discussion regarding these factors can be read in a review paper by Shea et al .…”

Section: Discussionmentioning

confidence: 99%

Effect of various factors on pull out strength of pedicle screw in normal and osteoporotic cancellous bone models

Varghese

Kumar

Krishnan

2017

Medical Engineering & Physics

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Section: Discussionmentioning

confidence: 99%

Effect of various factors on pull out strength of pedicle screw in normal and osteoporotic cancellous bone models

Varghese

Kumar

Krishnan

2017

Medical Engineering & Physics

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“…The important steps in the practice of screws with expandable character were thought to overcome the problems particularly encountered with the pedicular screws 9 . For the problems occurred in vertebral surgery during the application of pedicular screws and in revision surgery, many authors suggested the enlargement of screw dimension, careful care and attention for the preparation of the screw hole, the use of full-threaded screw and bone cement support 3,[11][12][13][14][15][16][17] .…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, such problems like adverse effects of PMMA exothermic reaction and foreign body effect should be considered. Calcium phosphate cement (CPC) instead of PMMA was preferred as an option 10,14,21,[23][24][25] .…”

Section: Discussionmentioning

confidence: 99%

The Evaluation of Pullout Tests of An Expandable Newly Designed Screw

Olcay¹,

Gülmez²,

Mutlu³

et al. 2013

Kafkas Univ Vet Fak Derg

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SummaryBiomechanical evaluation of pullout forces of newly designed cortical screws with openable tips was done in the tibia bone of the young bulls. Newly designed expandable titanium 14 cortical screws with openable tips were inserted in fresh tibia bone. Of these screws, 7 were used as controls. The bones were fixed with polymethylmethacrylate after the insertion of the screws. Screw heads were attached to a custom device and prepared for pullout tests. The elastic modulus values (Newton/mm 2 ), yield forces (Newton) and maximum forces (Newton) of expandable and control groups were assessed. The median of yield forces (Newton) of expandable cortical screw group was found to be statistically higher than that of normal group (P=0.025). The median of maximum forces of expandable cortical screw group was found to be significantly higher than that of normal group (P=0.003). In the comparison of paired groups, it was found that the pullout forces of expandable cortical screws were significantly superior to that of normal control group. In the light of these results, it was concluded that such kind of newly designed screws are able to contribute to fracture fixation in the future, allowing more bone contact without enlarging the diameter of the screw. Keywords: Expandable screw, Pullout test, Fracture, Bone Ekspanse Olabilen Yeni Tasarım Bir Vidanın Sıyırma (Pullout) Testlerinin Değerlendirilmesi ÖzetUcu açılabilir yeni tasarlanmış kortikal vidaların sıyırma kuvvetlerinin biomekanik olarak değerlendirilmesi genç boğaların tibia kemiğinde yapıldı. Yeni tasarlanmış ucu açılabilir 14 kortikal titanyum vida taze tibia kemiğine yerleştirildi. Bu vidaların 7 tanesi kontrol grubu olarak kullanıldı. Vidalar yerleştirildikten sonra kemikler polimetilmetakrilat ile fikse edildi. Vida başları özel bir alete bağlandı ve sıyırma testi için hazırlandı. Elastik modulus değerleri (Newton/mm 2 ), akma kuvveti (Newton) ve maksimum kuvvet (Newton) değerleri ucu genişleyebilen ve kontrol gruplarında değerlendirildi. Ucu genişleyebilen kortikal vida grubunun ortalama akma değerleri istatistiksel olarak normal gruba göre daha yüksek bulundu (P=0.025). Genişleyebilen kortikal vida grubunun maksimum güçlerinin ortalaması normal gruba nazaran önemli derecede yüksek bulundu (P=0.003). Eşlendirilmiş grupların karşılaştırılmasında genişleyen kortikal vidaların pullout kuvvetlerinin normal kontrol gruplara nazaran önemli derecede yüksek olduğu bulundu. Bu çalışmalarımızın ışığı altında yeni tasarlanmış böyle vidaların vida çapını genişletmeksizin daha fazla kemik kontağına izin vererek gelecekte kırık fiksasyonuna katkıda bulunabileceği tartışıldı.

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“…It is best to combine visualisation of screws with another diagnostic or therapeutic procedures, e.g., spinal probe or caudal epidural injections (Figs. 4,5,6] Measures to reduce screw loosening Improving screw-bone bonding was the target for many studies [13,16,31,32,34,39,42,45,48,49]. The most successful among these was the use of plasma-sprayed HA screws [13,16,32,34,45,49].…”

Section: Current Practice For the Diagnosis At Our Spinal Unitmentioning

confidence: 99%

Inter-observer reliability of detecting Dynesys pedicle screw using plain X-rays: a study on 50 post-operative patients

et al. 2009

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Enhancement of pedicle screw stability using calcium phosphatecement in osteoporotic vertebrae: in vivo biomechanical study

Cited by 52 publications

References 21 publications

Effect of various factors on pull out strength of pedicle screw in normal and osteoporotic cancellous bone models

Effect of various factors on pull out strength of pedicle screw in normal and osteoporotic cancellous bone models

The Evaluation of Pullout Tests of An Expandable Newly Designed Screw

Inter-observer reliability of detecting Dynesys pedicle screw using plain X-rays: a study on 50 post-operative patients

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