Results 281 to 290 of about 2,082,190 (352)

The effect of screw holes on bone strength

The Journal of Foot and Ankle Surgery, 1997
Internal fixation devices continue to be used in the fixation of foot and ankle fractures and osteotomies. Because of the increased use of fixation techniques, postoperative care following removal of internal fixation devices assumes a vital role in the success of these procedures.
B A, Johnson, L M, Fallat
openaire   +2 more sources

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

Biomechanical properties of small bone screws

Journal of Oral and Maxillofacial Surgery, 1994
To evaluate systematically the biomechanical properties of 13 popular screw designs, ranging from 0.8 to 2.0 mm in diameter.Screws were characterized in terms of external, core, and drill diameter; cutting flute and head design; material; pitch, thread depth; and height of shank (unthreaded portion) and shank with plate.
Z H, You, W H, Bell, E D, Schneiderman, R B, Ashman   +3 more
openaire   +2 more sources

The effect of screw insertion angle and thread type on the pullout strength of bone screws in normal and osteoporotic cancellous bone models

Medical Engineering and Physics, 2010
Duncan E T Shepherd, David W L Hukins
exaly   +2 more sources

Optimizing Bone Screw Pullout Force

Journal of Orthopaedic Trauma, 1990
Stability of internal fixation by plate and screw depends on the interface of bone and screw threads. Bone-screw thread design was tested in a synthetic bone model to determine maximum bone-screw pullout force. The model was confirmed to provide reproducible results in a clinically relevant range.
T A, DeCoster, D B, Heetderks, D J, Downey, J S, Ferries, W, Jones   +4 more
openaire   +2 more sources

Prediction of Stress Shielding Around Orthopedic Screws: Time-Dependent Bone Remodeling Analysis Using Finite Element Approach

Journal of Medical and Biological Engineering, 2015
Gholamreza Rouhi, Masoud Tahani, Walter Herzog   +2 more
exaly   +2 more sources

An alternative to screws for plating osteoporotic bone

Journal of Biomedical Engineering, 1993
There are several problems with existing techniques used to plate broken bones. One of the most serious is that of screws pulling out during insertion or healing in patients suffering from osteoporosis. This paper investigates the mechanism of this pulling out, and proposes an alternative device to attach plates to weak bones.
T S, King, D, Cebon
openaire   +2 more sources

Experimental study on the loosening of pedicle screws implanted to synthetic bone vertebra models and under non-pull-out mechanical loads.

Journal of The Mechanical Behavior of Biomedical Materials, 2019
BACKGROUND Pull-out tests have been widely applied to orthopaedic devices such as pedicle screws for the last decades. Despite their wide applicability, this particular pedicle screw testing method does not represent the load pattern of implanted ...
B. Nowak
semanticscholar   +1 more source

Factors Affecting the Pullout Strength of Cancellous Bone Screws

Journal of Biomechanical Engineering, 1996
J R Chapman, R M Harrington, P A Anderson   +2 more
exaly   +2 more sources

Slippage Between Screwdriver and Bone Screw

Clinical Orthopaedics and Related Research, 2002
Cortical 3.5-mm stainless steel screws with hexagonal heads and corresponding screwdrivers from two manufacturers were investigated. Measurement of dimensions and torsional testing were done to study slippage between the screw and the driver bit. There were only small differences in dimensions between the manufacturers.
Jon K, Behring, Nils R, Gjerdet, Anders, Mølster   +2 more
openaire   +2 more sources