Why is the meniscus important

The meniscus plays a vital role in maintaining the stability of the knee joint along with optimizing the tibiofemoral load transfer and distribution. This also helps in preserving the health of the articular cartilage.


Why is meniscus important in water?

Why a meniscus occurs Adhesion is responsible for a meniscus and this has to do in part with water’s fairly high surface tension. … And since water molecules like to stick together, when the molecules touching the glass cling to it, other water molecules cling to the molecules touching the glass, forming the meniscus.

Which meniscus is more important?

The lateral meniscus is even more important than the medial meniscus for shock absorption. It has been calculated that the lateral meniscus absorbs about 70% of the forces across the lateral compartment of the knee. Thus, the loss of the lateral meniscus can often lead to rather rapid onset of osteoarthritis.

What is meniscus tool?

Contact angle and surface tension The formation of menisci is commonly used in surface science to measure contact angles and surface tension. In a contact angle measurement, the shape of the menisci is measured with a balance or optically with a digital camera.

Why is it necessary that the eye should be at the same level as the bottom of the meniscus when reading the level of the liquid in a graduated cylinder?

Your eye must be on the same level as the bottom of the meniscus to read the volume correctly. The meniscus formed by a non-wetting liquid, such as mercury (Hg), is convex with the highest point in the center. In the case of a convex meniscus, the highest point is used to make the reading.

How do you read a meniscus on different liquids?

If the meniscus is a concave meniscus, read at the lowest level of the curve. If the meniscus is convex, take your measurement at the highest point of the curve. The short answer: Take your measurement from the center of the meniscus. It’s that easy.

What is it called when water goes above the rim?

Cohesion of water Before it overflows, the water forms a dome-like shape above the rim of the glass. … Cohesion refers to the attraction of molecules for other molecules of the same kind, and water molecules have strong cohesive forces thanks to their ability to form hydrogen bonds with one another.

What is upper and lower meniscus?

Reading a Meniscus For a concave meniscus, the volume of the liquid in the container is read from the bottom of the curve. You may notice a ‘line’ of liquid at the very top, forming the curve itself. The bottom of the curve is the lower side of this line.

Why is a meniscus higher at the side than in the middle?

With most liquids, the attractive force between the liquid and the container is greater than the attraction between the individual liquid molecules. … A few liquids have a “backwards” meniscus. An example is mercury. If you put mercury in a test tube, it would be higher in the middle than at the edges.

Why do we read lower meniscus?

The lower meniscus must be read while measuring the volume of colourless or transparent liquids but the upper meniscus while using colured ones because the phase boundary in the colourless liquid is clearly visible so it is easy to read it.

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Where do you read the meniscus?

The key to getting an accurate reading, is to measure the center of the meniscus whether it be concave or convex. E.g. with a concave meniscus, measure the bottom of the meniscus and for convex meniscus, take the reading from the top of the meniscus. (See diagram reading line in the diagram A and B).

Which is worse lateral or medial meniscus tear?

Is the lateral meniscus tear worse than a medial meniscus tear? It is hard to differentiate what type of tear is worse if it is repairable. However, it is well known that if a lateral meniscus is taken out, the consequences are almost always worse than having a medial meniscus resected.

What type of meniscus tears require surgery?

The most common type of tear to the meniscus is a radial tear. This type of tear occurs in the area of the knee that isn’t supplied with blood, so it cannot heal on its own. Surgery may be required if the tear is severe. In the case of a radial tear, the surgeon will trim away the damaged part of the meniscus.

How do I strengthen my knee after meniscus tear?

  1. Quad sets.
  2. Straight-leg raise to the front.
  3. Straight-leg raise to the back.
  4. Hamstring curls.
  5. Heel raises.
  6. Heel dig bridging.
  7. Shallow standing knee bends.

Does a meniscus tear cause fluid on the knee?

Secondary effects. A torn meniscus often causes the knee to make extra joint fluid. There is more room in the knee for fluid when the knee is slightly bent. Therefore, people with chronic swelling tend to hold the involved knee in a bent position and develop hamstring tightness and joint contracture.

What is a torn meniscus in the knee?

The meniscus is a C-shaped piece of tough, rubbery cartilage that acts as a shock absorber between your shinbone and thighbone. It can be torn if you suddenly twist your knee while bearing weight on it. A torn meniscus is one of the most common knee injuries.

What is meniscus measurement?

A concave surface of a liquid resulting from surface tension. The bottom of the meniscus is used to measure the volume of a liquid in apparatus such as a graduated cylinder.

Why does water stay in a glass when it is upside down?

When you first turn the cup upside down, the pressure of the air inside the cup and the air pressure outside the cup are equal. … The pressure of the air outside the cup is now greater than the pressure inside the cup and the card stays in place.

Why does water not overflow in a cup?

When we fill the glass with water, we notice right away that it can go over the brim of the glass without spilling. This is because of surface tension. … This attraction causes the molecules to stick together and avoid spilling down the side of the glass like gravity would like them to.

What is the property called that describes water sticking to itself?

Water has an amazing ability to adhere (stick) to itself and to other substances. The property of cohesion describes the ability of water molecules to be attracted to other water molecules, which allows water to be a “sticky” liquid.

Do you read mercury at the bottom of the meniscus?

Measure so that the line you are reading is even with the center of the meniscus. For water and most liquids, this is the bottom of the meniscus. For mercury, take the measurement from the top of the meniscus. … You won’t be able to take an accurate reading looking up at the liquid level or down into it.

When reading a graduated cylinder reading the water level correctly is important Explain what a meniscus is and why it is important when reading a graduated cylinder?

Terms in this set (13) Why does a meniscus occur? When reading a volume in a graduated cylinder, it is also important that your eyes are level so that you are not looking at the meniscus from the top or the bottom. THe graduated cylinder also needs to be on a level table. Thus you will need to bend down to read it.

Which meniscus should be read for colored liquids?

During lab experiments especially in chemistry, we are always told to take a reading at bottom of the meniscus for colourless liquids and the upper meniscus of coloured liquids.

Why does water have a low vapor pressure?

Vapor Pressure. … The hydrogen bonding between liquid water molecules explains why water has an unusually low vapor pressure. Relatively few molecules of water are capable of escaping the surface of the liquid and enter the vapor phase. Evaporation is slow and thus the vapor exerts a low pressure in a closed container.

What are the two types of meniscus?

The menisci — the medial meniscus and lateral meniscus – are crescent-shaped bands of thick, rubbery cartilage attached to the shinbone (tibia). They act as shock absorbers and stabilize the knee. The medial meniscus is on the inner side of the knee joint. The lateral meniscus is on the outside of the knee.

Where do you need to orient your eye level to take an accurate reading of the meniscus?

Steps to reading Graduated Cylinders: The water in a cylinder will form a curve called the meniscus 3. Your eye should be level with the top of the liquid 4. Find the bottom of the curved meniscus in the water. This should be in the center of the graduated cylinder.

What liquids form convex meniscus?

When liquid mercury is confined in a tube, its surface (meniscus) has a convex shape because the cohesive forces in liquid mercury tend to draw it into a drop.

Why is the meniscus of water is curved downwards while that of mercury is curved upwards?

When mercury is put in a measuring cylinder, the meniscus curves downwards. This is due to the greater cohesive force within the mercury atoms compared to the adhesive force between the mercury atoms and measuring cylinder.

Does a graduated cylinder measure?

A graduated cylinder, also known as a measuring cylinder or mixing cylinder is a common piece of laboratory equipment used to measure the volume of a liquid. It has a narrow cylindrical shape. Each marked line on the graduated cylinder represents the amount of liquid that has been measured.

How many medium tick marks mean?

Explanation: To read a graduated cylinder, first determine how much volume is represented by each tick mark. There are 10 tick marks from 20 mL to 40 mL, so each tick mark represents 2 mL. Next, read the volume from the bottom of the meniscus. The bottom of the meniscus is aligned with the tick mark representing 28 mL.

Will a knee brace help a torn meniscus?

Wearing a brace can help limit the stress placed on your meniscus while it heals and protect you from re-injury. As a result, you can be more physically active throughout your recovery and get back to doing what you love sooner.