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How does and what the MRI of the knee joint shows?
Magnetic resonance imaging is one of the safest methods of radiation examination of tissues.
The peculiarity of this method is the use of magnetic radiation, while other types of tissue studies include the use of X-rays( which can cause negative consequences).
The principle of the MRI is to obtain a volumetric image, when exposed to radio-frequency pulses of different duration and structure on certain tissues.
They have differences in the intensity of the signals, which affects the degree of contrast when the image is acquired.
Liquids have a strong signal, so they will be brightly colored, whereas bone tissues have a weaker signal, which makes them dark on the image. Thus, the technique allows you to get a picture in all planes.
It is better than other methods to determine the nature of cartilage tissue damage.
Contents of the article
- What are the purposes of examining knee joints?
- MRI: apply can not be canceled
- Getting ready for the
- study Contrast substances in the
- study of ultrasound and MRI: is there a difference?
- Not cheap, but effective
- Where to go for the
study Why are knee joints being examined? The
MRI is characterized by the ability to track more anatomical structures. A snapshot visualizes the condition not only of the bone component, but also of nearby tissues.
The interpretation of the MRI of the knee joint shows damage to the meniscus, changes in the joint-ligament apparatus, and the condition of the tendon sheaths.
Sports medical institutions use tomography to determine possible ruptures of athlete's ligaments. The method is fairly reliable( up to 97%).
MRI is the only method of investigation for such diseases as: Glanzmann's myodystrophy, tumors in the initial stages, adhesions.
MRI is also widely used in the detection of abnormalities of various anatomical structures of the knee - venous system, vessels, nerve trunks.
Magnetic resonance imaging of the knee joint is prescribed in the following cases:
- damage to connective tissues( tendons, meniscus);
- sports injuries;
- infectious diseases;
- fluid in the joint;
- Implantation disorders;
- bleeding, general mobility impairment and other.
MRI: can not be applied
During the course of the study, the specialist receives a three-dimensional image of the part to be examined, which can detect abnormalities or changes in any area and tissue of the joint.
However, MRI is not only used in cases of chemical or mechanical damage.
Often this method is used due to the impossibility of using other types of research. For example, due to individual patient contraindications, such as:
- , the presence of implants in the body;
- non-removable hearing aids;
- large debris, shavings and other metallic foreign bodies;
- the presence of a pacemaker.
However, there are also relative contraindications, in which the procedure is negotiated with a specialist individually.
The following factors may serve as reasons for abandoning the study:
- heart failure;
- presence of non-removable prosthesis or valves( cardiac);
- tattoos on the investigated area of the body;
- lactation period;
In addition, it is worth noting that some people after MRI have pain or aches in their teeth. This is due to the fact that the patient may have dental braces or fillings containing metal.
Preparing for the
study Given all of the above points, for a safe and accurate study, it is important to follow the preparation procedure before the MRI of the knee:
- in the presence of an inflammatory process, you should take an analgesic prescribed by your doctor;
- remove clothing that contains metal parts or accessories;
- remove hearing aids( removable) and other electronic devices;
- for the exclusion of excitation conditions, it is possible to take sedatives;
- people, with increased sensitivity to noise, should wear ear pads( in the apparatus the ventilation system works);
- should be immobilized during the prescribed procedure during the prescribed time.
. In some cases, the doctor may say to change the position of one or another part of the body. This is done through a two-way communication system.
That allows the specialist to adjust the position of the patient within the device during the course of the examination.
In addition, most devices are equipped with a video surveillance system, this gives the patient a greater security guarantee. Some clinics offer during the survey to listen to music, which has a more relaxed atmosphere inside the camera.
How the MRI of the knee joint passes can be seen in the video:
Contrast substances in the study of
There are times when it may be necessary to inject the patient with a contrast medium intravenously during the study.
This method of MRI is called contrast and is performed to identify processes that are invisible during routine diagnostics.
The essence of the method is that the injected drug changes the parameters of surrounding tissues. Most of the substances are made on the basis of gadolinium and iron oxide. Substances have a different mechanism of action.
Before the study, you need to know the presence of an allergic reaction to contrast media. It is important to consider the availability of resuscitation equipment when choosing an institution for MRI behavior.
But the forms of complications that require their intervention are extremely rare( 0.1% of all cases).
Ultrasound and MRI: Is there a difference?
In most cases, ultrasound is used to examine the joint. This happens, firstly, because of the relative cheapness of the survey and the equipment itself, and secondly, the use of ultrasound has practically no contraindications.
A distinctive feature of ultrasound is that the examination takes place in real time, which negatively affects the creation of visual confirmation.
Magnetic resonance imaging , in turn, is more suitable for the study of bone tissue( whereas ultrasound, in general, is used in the diagnosis of soft tissues).In individual cases, a study using tomography is necessary.
But, it is important to remember that, taking into account the cost of the devices for tomography, their distribution in the country is not very wide.
Also, most of the closed MRI devices are not designed for patients who are overweight. While for the conduct of ultrasound, the dimensions of the subject are not an obstacle.
Not cheap, but effective
Russia is one of the leading countries in this field, however, no MRI device has been produced in our country. Equipment of this type is purchased abroad. That significantly affects the area of distribution of this service and its cost.
The average price of the MRI of the knee joint is from 3500 to 15000 rubles , depending on the organ being examined and the expected diagnosis.
The average cost in Russia is 4000 rubles. But, it is worth considering that in all regions prices are significantly different.
Besides, many clinics offer additional services, paid separately( creating duplicate imprisonments, recording the result on a disk).The cost of additional services is approximately 500-1000 rubles for each.
Where to go for the
study You can perform this type of examination in the following establishments:
- Moscow, metro Kashirskaya, Kashirskoye shosse, 68, bldg.2;
- St. Petersburg, 16th line of the VO, d. 81;
- Vil'skogo 11, Krasnoyarsk, Krasnoyarsk Territory.
In order to understand whether it is necessary to undergo an MRI it is worth to evaluate all the pros and cons of this technique. Consult with a specialist in the field.
If you still have a study, choose a proven clinic. And when carrying out the procedure, it is important to remember the contraindications, and if there is any doubt, ask your doctor about them again.