An arthroscope is designed for visual examination for diagnostic purposes and for performing surgical procedures on the joints of adults and children under visual control. A little history... The history of arthroscopy began in the 1930s. It is primarily associated with Professor Takagi of the University of Tokyo. In 1918, during a cadaveric study, he first examined the knee joint through an arthroscope. The diameter of his instrument in 1920 was 7.3 mm. The school he founded at the University of Tokyo subsequently gained worldwide fame thanks to the work of Takagi's student, Professor Watanabe. In 1931, Takagi created a 4 mm diameter instrument, which allowed for synovial biopsy. The first color photographs of intra-articular structures of the knee were also obtained at that time. The first device with a "cold" light source was the improved "Watanabe No. 21", and soon the "Richard Wolf" arthroscope was created in Germany. The next phase of improvement of the arthroscopic system was the creation of the wide-angle "Hopkins" optics, which, in addition to increasing the angle of view, provides a significantly higher level of illumination. The arthroscope is an optical device. The arthroscope is based on a system of lenses placed in a rigid metal tube. At the base of the arthroscope is an adapter to which a light cable is connected [ https://eleps.ru/katalog/artroskopiya-optika-kabeli-osvetitelnye-dlya-artroskopov/ ]. At the other end of the arthroscope is an objective lens. The objective plane can be located either on the end of the arthroscope or on its side surface. The position of the objective plane is determined in two ways. First, the plane is determined by a special mark, which is visible in the eyepiece at the edge of the field of view. Secondly, a light cable is attached to the arthroscope on the side opposite the lens plane. Arthroscopes are available with different viewing angles. Systems with 30-degree and 70-degree viewing angles are most commonly used. Modern optical systems have a field of view (cone) of 80-90 degrees. The field of view increases as the instrument rotates around its axis. The field of view of a 30-degree arthroscope allows one to see objects directly and slightly to the side of the lens. The field of view of a 70-degree arthroscope allows one to see objects located to the side. Almost all areas of the knee joint can be examined using a 30-degree optic. A 70-degree arthroscope is used to examine the posteromedial portion of the medial meniscus, the patella, the anterior fat pad, and the posterior recesses. In addition to the optical tube, the device requires access instruments. The arthroscope's illumination system provides good cold-light illumination of the object and is compatible with illuminators from various manufacturers. The arthroscope's design also allows for examinations using video equipment. The arthroscope is used in specialized departments of hospitals and clinics. For more information on prices and types of arthroscopes, please refer to the Catalog [https://eleps.ru/katalog/] in the Arthroscopy section [https://eleps.ru/katalog/artroskopiya/].