Results 221 to 230 of about 105,819 (269)

Bone screw design: analytical formulation

Proceedings of 16th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2002
Presents a formula for reliably predicting holding power of bone screws, something which has not previously been reported. This formulation is of value to the orthopaedic clinician in general and osteosynthesis research in particular. In this study, based on the experimental data and some biomechanical considerations, the authors proposed an analytical
K. Firoozbakhsh, T.A. DeCoster, M.S. Moneim   +2 more
openaire   +1 more source

Cancellous Screws Are Biomechanically Superior to Cortical Screws in Metaphyseal Bone

Orthopedics, 2016
Cancellous screws are designed to optimize fixation in metaphyseal bone environments; however, certain clinical situations may require the substitution of cortical screws for use in cancellous bone, such as anatomic constraints, fragment size, or available instrumentation.
Tim, Wang, Christopher, Boone, Anthony W, Behn, Justin B, Ledesma, Julius A, Bishop   +4 more
openaire   +2 more sources

Fracture Fixation with Screws and Bone Plates

Veterinary Clinics of North America: Small Animal Practice, 1999
The treatment goal of fracture fixation is to restore the patient to normal function as quickly as possible. Fracture fixation can be accomplished by various means; fixation with screws and bone plates is not only a popular but a successful technique. In this article, the authors provide concepts that a surgeon must understand for successful screw and ...
M, Conzemius, S, Swainson
openaire   +2 more sources

Bone Allograft Pedicle Screw Augmentation

Clinical Spine Surgery
Study Design: We performed a comprehensive cadaveric biomechanical study to compare the fixation strength of primary screws, screws augmented with bone allograft, and screws augmented with polymethylmethacrylate cement. Objective: To evaluate a novel technique for screw augmentation
Lauren, B., Paul, K., Lorne, B., Rizkallah, M., Steffen, T., Loon, J.V., Aoude, A., Ouellet, J., Kroeze, R.J., Spruit, M.   +9 more
openaire   +3 more sources

Cortical bone failure mechanisms during screw pullout

Journal of Biomechanics, 2012
An experimental and computational study of screw pullout from cortical bone has been conducted. A novel modification of standard pullout tests providing real time image capture of damage mechanisms during screw pullout was developed. Pullout forces, measured using the novel test rig, have been validated against standard pullout tests.
Emer M, Feerick, J Patrick, McGarry
openaire   +2 more sources

Extraction Strength of Cannulated Cancellous Bone Screws

Journal of Orthopaedic Trauma, 1993
The purpose of this study was to determine whether the alterations in the relative dimensions of thread and core diameter that accompany cannulation of cancellous bone screws affect their holding strength. The screws were inserted in bovine femoral cancellous bone and mounted in the load train of a materials testing system.
T C, Hearn, J, Schatzker, N, Wolfson
openaire   +2 more sources

Alendronate Improves Screw Fixation in Osteoporotic Bone

The Journal of Bone & Joint Surgery, 2007
Animal studies have demonstrated the efficacy of the use of bisphosphonates to enhance screw fixation in bone. In this prospective, randomized study of pertrochanteric fractures treated with external fixation, we tested whether systemic administration of bisphosphonates would improve the fixation of hydroxyapatite-coated screws implanted in ...
MORONI, ANTONIO, FALDINI, CESARE, Hoang Kim A, PEGREFFI, FRANCESCO, GIANNINI, SANDRO   +4 more
openaire   +4 more sources

T-Screw. A new bone fixation device

Journal of the American Podiatric Medical Association, 1989
The T-Screw was patented in 1984. A 5-year study was begun in 1980, and FDA approval was granted in 1985. Detailed results of this clinical study will be reported in a later paper. The purpose of this paper is to introduce the device. The authors have found that early return to normal function and wearing shoes has been possible when using T-Screws for
T K, Lichty, W W, Gronen, J D, Johnson, W K, Oliver   +3 more
openaire   +2 more sources

Cortical bone trajectory for lumbar pedicle screws

The Spine Journal, 2009
Achieving solid implant fixation to osteoporotic bone presents a clinical challenge. New techniques and devices are being designed to increase screw-bone purchase of pedicle screws in the lumbar spine via a novel cortical bone trajectory that may improve holding screw strength and minimize loosening. Preliminary clinical evidence suggests that this new
B G, Santoni, R A, Hynes, K C, McGilvray, G, Rodriguez-Canessa, A S, Lyons, M A W, Henson, W J, Womack, C M, Puttlitz   +7 more
openaire   +2 more sources

Predicting cancellous bone failure during screw insertion

Journal of Biomechanics, 2013
Internal fixation of fractures often requires the tightening of bone screws to stabilise fragments. Inadequate application of torque can leave the fracture unstable, while over-tightening results in the stripping of the thread and loss of fixation. The optimal amount of screw torque is specific to each application and in practice is difficult to attain
Karen J, Reynolds, Tammy M, Cleek, Aaron A, Mohtar, Trevor C, Hearn   +3 more
openaire   +2 more sources