(Greek meniskos > Latin meniscus: a crescent-shaped body, a curved structure, lunar crescent form, semilunar cartilage; diminutive of mene, "moon")
Each of these wedge-shaped crescents of knee joints have shock absorbers that resist impacts when running, jumping, etc.
Violent rotational movements of the thighs or legs while the knee joints are flexed; as in, football, soccer, skiing, or other sports, can severely damage the menisci or cartilage disks when they are squeezed between the bones of the knee joints.
The lateral menisci of the knees are toward the outer sides of the knee couplings and they serve to evenly load the surfaces during the body's weight-bearing, and also aid in providing fluids for the lubrications of the contacting points.
The medial menisci of the knees provide outer curves for conjoining links to move on, serve to evenly load the structures during walking, and aid in disbursing fluids to the joints for lubrication of those skeletal parts.
For more detailed information, go to this link about meniscal-knee damage.
A meniscectomy is performed when a meniscus, or connective tissue, has been badly damaged, usually as a result of an injury which causes the knee, or knees, to lock or to give way repeatedly.
Removing the damaged part of the structural component with a meniscectomy can cure the symptoms of the injury; however, it can also increase the likelihood of premature osteoarthritis; so, the operation is avoided whenever it is possible.
The main function of the meniscus is to reduce frictions when the connecters are moving.
Each of the knee hinges has two menisci; the wrist links and temporomandibular junctions (jaw links) have a meniscus for each closure.
A meniscus is an anatomic feature; for example, the medial meniscus of the knee is a crescent-shaped cartilage pad between the two linking connecters formed by the femur (the thigh bone) and the tibia (the shin bone)."
The meniscus acts as a smooth surface for the hinges to move on and the medial meniscus is toward the inner (medial) side of the knee connection.
The menisci are often used to refer to one of the semilunar fibrocartilaginous disks in the various intersections of the body.
The word meniscus comes from Greek and refers to a "crescent-shaped structure" and so, today a meniscus is something that is shaped like a crescent moon.
- To move from water to land, a water-walking creature may have to scale a steep, slippery slope—the curved edge where water meets leaf, rock, or floating object.
- The curvature of a liquid's surface at a boundary is a consequence of the liquid's surface tension.
- The sloped surface marking the border between wet and dry is called the meniscus.
- Very small insects typically can't climb these frictionless mountains using their normal rowing motions or running gaits.
- If they try to walk up, they slide back down.
- Instead, these insects have to rely on a novel form of propulsion that doesn't require moving their legs back and forth.
- As this water treader approaches a meniscus, its front and rear legs deform the water's surface to help it move up the slope.
- Two species of water strider, for example, have retractable claws on their front and hind legs that allow them to pull up on the water to create tiny peaks.
- At the same time, the central pair of legs presses down on the water to form dimples in the surface.
- Because the insects are small, these peaks and dimples create sufficient force to pull the insects up the slope.
- In effect, the insect creates tiny menisci with its front and rear legs.
- Because menisci are attracted to other menisci, the net effect is to pull the insect up the slope at the water's edge.
- These creatures can reach speeds as high as thirty body lengths per second.
- In technical terms, the insects take advantage of lateral capillary forces that exist between small floating objects.
- The force of attraction between body and meniscus "wall" depends on the body's buoyancy and on its distance from the wall.
- Because the insect's front legs are closer to the wall than its rear legs are, the net effect is to propel the insect forward and upward.
- The larva of the waterlily leaf beetle uses an alternative strategy to scale a slippery meniscus.
- A poor swimmer, this creature simply arches its back, creating a meniscus at each end. The insect then gets pulled up the slope to a leaf.
- In meniscus climbing, the researchers note, instead of moving its legs back and forth, an insect deforms the liquid's surface, converting muscular strain to the surface energy that powers its ascent.
- In the realm of fluid dynamics, few researchers have previously tackled situations that involve surface tension as an important component.
- The new results and related research may have important applications not only for understanding biolocomotion but also potentially in nanotechnology.