Related Experiment Video
Updated: Feb 5, 2026
15:12
Preparation of Rat Tail Tendons for Biomechanical and Mechanobiological Studies
Published on: July 30, 2010
17.5K
Effect of anchor threads on the pullout strength: A biomechanical study
Hideaki Nagamoto1, Nobuyuki Yamamoto2, Eiji Itoi2
1Department of Orthopaedic Surgery, Kurihara Central Hospital, Kurihara, Japan.
Journal of Orthopaedics
|September 1, 2018
Summary
Anchor insertion angle significantly impacts pullout strength. A 45° angle yielded the greatest pullout strength for thread-less metallic anchors in synthetic bone, outperforming 90° and 135° angles.
Area of Science:
- Orthopedic biomechanics
- Biomaterials science
- Surgical implant design
Background:
- Understanding anchor biomechanics is crucial for orthopedic procedures.
- The influence of insertion angle on anchor fixation strength requires further investigation.
Purpose of the Study:
- To evaluate the effect of anchor insertion angle on the pullout strength of thread-less metallic anchors.
- To compare pullout strength at different insertion angles (45°, 90°, 135°).
Main Methods:
- Pullout tests were performed using a universal testing machine.
- Thread-less metallic anchors were inserted into synthetic cancellous bone at 45°, 90°, and 135°.
- Anchors were subjected to pullout at a 45° angle from the surface.
Main Results:
- The maximum load to failure was significantly higher for anchors inserted at a 45° angle compared to 90° or 135°.
- Optimal pullout strength for thread-less anchors was achieved when inserted at 45° to the bone surface.
Conclusions:
- The insertion angle is a critical factor influencing the pullout strength of thread-less metallic anchors.
- A 45° insertion angle provides superior fixation strength in synthetic cancellous bone.
Related Concept Videos
01:25The Anchoring-and-Adjustment Heuristic
7.8K
In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the...
7.8K
01:03Anchoring Junctions
5.0K
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
5.0K
01:32Lipids as Anchors
7.4K
In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
7.4K
03:05Acid Strength and Molecular Structure
33.1K
Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
33.1K
01:20Strength of Cement
504
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
504
01:30Relation Between Tensile Strength and Compressive Strength of Concrete
685
Concrete is a fundamental building material, and understanding its strengths is crucial for construction projects. The relationship between its tensile and compressive strengths is intricate, showing that while these strengths are related, they do not increase at the same rate. Tensile strength's growth is slower and is affected by various factors such as the methods used for testing, the size and shape of the specimen, the texture of the aggregate used, and the moisture content of the...
685