Ligament Stability
Ligament Stability - Related Videos
03:18
Nuclear Stability
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2020
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters. To hold positively charged protons together in the...
01:53
RNA Stability
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2019
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
08:03
Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model
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Cited by 7 •
2017
We present a model of ligament tissue in which three-dimensional constructs are treated with the human exercise-conditioned serum and analyzed for collagen content, function, and cellular biochemistry.
10:32
Athymic Rat Model for Evaluation of Engineered Anterior Cruciate Ligament Grafts
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Cited by 11 •
2015
Animal models are important tools for the evaluation of tissue-engineered grafts. This paper presents the protocol for preparing an electrospun biodegradable polymer graft for use in anterior cruciate ligament tissue engineering, as well as a surgical protocol for implantation in a rat model.
13:10
Stability of Floating Vessels
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2023
Source: Alexander S Rattner and Kevin Rao Li Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA The objective of this experiment is to demonstrate the phenomenon of stability of floating vessels - the ability to self-right when rolled over to the side by some external force. Careful design of hull shapes and internal mass distribution enables seagoing vessels to be stable with low drafts (submerged depth of hull), improving vessel...
FAQs
Collagen fiber organization helps determine how effectively a ligament withstands tensile loading, while mechanical stiffness limits excessive deformation. The ligament’s attachment to bone also contributes to force transmission across the joint. Together, these structural features influence how reliably the ligament restrains unwanted motion without preventing the controlled movement needed for normal function.
Ligament stability depends on more than the ligament itself. Muscle activity can support joint control, joint geometry influences how surfaces move and align, and sensory feedback provides information about position and motion. These interacting factors help regulate movement and may affect how instability appears during functional observation, rather than only during isolated physical testing.
Injury or laxity can reduce the ligament’s restraint, allowing joint motion to exceed the range normally controlled by intact tissues. This changes how forces and movement are distributed through the joint and may produce observable functional instability. The extent of altered mechanics helps clinicians distinguish concerns such as sprains, partial tears, and complete ruptures.
Clinical evaluation combines several sources of information rather than relying on one finding. Physical examination assesses the joint directly, stress testing examines motion under applied challenge, and functional observation considers how the joint behaves during use. Together, these approaches help identify abnormal restraint and support classification of the suspected ligament injury.
Imaging is used when additional structural information is indicated after the clinical assessment. It complements physical examination, stress testing, and functional observation by contributing evidence relevant to suspected sprains, partial tears, or complete ruptures. This combined assessment helps clinicians characterize the injury more fully and make better-informed decisions about subsequent management.
Assessment findings help match treatment decisions to the extent of impaired restraint and altered joint mechanics. Clinicians may use them to plan rehabilitation, determine whether bracing is appropriate, or consider surgical options. Repeated evaluation also helps monitor recovery, identify persistent instability, and reduce the risk of reinjury during the return to function.