Metallic Interference Screws
Metallic Interference Screws - Related Videos
02:18
Interference and Diffraction
0 Views •
2020
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other. Alternatively, if the two waves coincide and interact in a way such that the trough of one wave coincides with the peak of the other (in an out of phase manner), the resultant wave will...
08:41
Interference and Diffraction
0 Views •
2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Interference and diffraction are characteristic phenomena of waves, ranging from water waves to electromagnetic waves such as light. Interference refers to the phenomenon of when two waves of the same kind overlap to give an alternating spatial variation of large and small wave amplitude. Diffraction refers to the phenomenon of when a wave passes through an aperture or...
01:23
RNA Interference
0 Views •
2019
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated. This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
09:06
RNA Interference in Ticks
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Cited by 49 •
2011
A method for RNA interference (RNAi) by injection of dsRNA into unfed ticks is described. RNAi is the most widely used gene-silencing technique in ticks where the use of other methods of genetic manipulation has been limited.
01:21
Screw: Problem Solving
0 Views •
2023
In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided. To evaluate the...
FAQs
The threads advance into the bone tunnel beside the tendon or ligament graft rather than simply placing hardware at a distance from it. As the screw enters, it presses the graft radially against the tunnel wall. This interference increases immediate mechanical stability and holds the graft in position while biological incorporation and healing occur.
Radial compression keeps the graft closely apposed to the surrounding bone, limiting unwanted movement within the tunnel. That stable contact is important because the graft must remain positioned during the period of healing. The screw therefore contributes more than simple retention: it creates a compressed interface intended to support later graft incorporation.
These metallic materials provide the strength needed for immediate graft fixation and remain visible on radiographic imaging. Visibility can help clinicians identify the hardware and assess its location, but metal may also produce imaging artifacts. Consequently, material choice has practical implications for both mechanical support and postoperative imaging.
The graft is positioned within the prepared bone tunnel, and the screw is advanced alongside it. Thread advancement compresses the graft against the tunnel wall and establishes interference fixation. This placement provides immediate stabilization before healing has secured the graft biologically, making accurate positioning and firm tunnel contact central to the procedure.
Their principal application is securing tendon or ligament grafts within bone tunnels, particularly during anterior cruciate ligament reconstruction. In that setting, the device helps stabilize the reconstructed graft against bone while healing progresses. The same fixation principle is relevant when other tendon or ligament grafts require secure tunnel-based attachment.
Metallic fixation offers strength and radiographic visibility, but clinicians must account for imaging artifacts that can obscure nearby structures or complicate interpretation. The hardware may also require later removal in some circumstances. These considerations are balanced against the screw's immediate fixation function and its role in maintaining graft stability during healing.