Screw-bone interface failure at the uppermost and lowermost vertebrae is not uncommon.
Although experimental and clinical studies state that early regenerative phase of bone healing after trauma is sensitive to NSAID [ 9, 10, 17, 18], our study revealed no evidence of radiological or clinical failure at the bone-implant or cement-bone interface at subsequent follow-up.
Therefore, the bony avulsion failure is more common at low strain rates because the bone failure point is reached first.
Shortly after he developed a fracture of the right femoral bone, he died of respiratory failure at the age of 41.
The first three were the indices of implant and bone failure that were calculated in terms of maximal von Mises stresses at screws, plates, and surrounding bone.
No macroscopically observable failure at the bone-implant interface or of the implant itself was observed in any of the tests.
In an attempt to identify the modes of failure of a constrained tripolar implant, it was found that in 43 revised components the causes of revision included failure at the bone-implant interface and failure of the retaining mechanism (Guyen et al. 2008).
The selection of bone failure criterion is challenging.
The screws were then pulled out from the bone until failure, at a constant speed of 0.1 mm/s.
Spinal deformity surgery in elderly patients is associated with an increased risk of implant loosening due to failure at the screw-bone interface.
