Biomed endoprostheses. Endoprostheses from America. Qualitative characteristics of Biomed implants

In endoprosthetics, a joint or its worn-out part is replaced with an implant. The Zimmer knee replacement is one of the most commonly used knee replacements to restore leg mobility. This American corporation operates all over the world, effectively developing and producing endoprostheses for various purposes. All products of the developers are personalized - produced according to the individual characteristics of each patient.

Manufacturers of American endoprostheses

When choosing a prosthesis, you should trust reliable manufacturers. The highest quality implants are produced by the following world-famous companies:

• Zimmer;
• Smith & Nephew;
• Biomet;
• DePuy (owned by Johnson & Johnson);
• Aesculap, B. Braun;
• Stryker.

These companies have scientific and production potential, have their own history, and are leaders in quality and sales volume. Their branches and factories are located in various countries, and their headquarters are in the USA. It would be wise for the doctor to choose a company that produces a joint endoprosthesis, since all companies have excellent products that differ little in terms of quality-price ratio.

For endoprosthetics, you need a full set of implants of different sizes, high-quality tools and equipment, and other materials. Therefore, there is no point in looking for a “cheaper and better” product on your own, without the participation of a surgeon. Doctors must recommend the best solution.

Types and description

The American company Zimmer offers a full range of necessary materials for prosthetics. Using the products of this company, they perform surgical interventions to replace knee, hip, elbow and shoulder joints. When manufacturing endoprostheses, the unique anatomical features of the body are taken into account.

Features of Zimmer prosthetics:

Knee joints

Zimmer High-Flex

The Zimmer endoprosthesis is used for unipolar prosthetics, when the knee joint is partially destroyed, its mobility is reduced, pain regularly occurs, but the leg is not completely immobilized. With High-Flex technology, the diseased joint is partially replaced. It allows you to safely increase your range of motion after surgery up to 155 degrees.

Zimmer NexGen

Is used for . Once the structure is installed, the knee can flex and rotate safely. The product is attached to the body tissues with bone cement. An important difference between NexGen and similar products is the possibility of rotational movements. The design properties reduce the likelihood of injury, pain, and destruction of the device. You can bend your knee up to 155 degrees, the range of rotation is 25 degrees.

When conservative treatment of arthritis and osteoarthritis is ineffective, surgery is prescribed to replace the diseased joint. The Zimmer knee replacement is considered the best in the joint replacement industry. It relieves pain and discomfort and restores mobility to a person.

Advantages of American endoprostheses

This branch of orthopedic surgery is more developed than others in the United States of America and operations exceed others in frequency. Throughout history, almost half a million operations have been performed, which gives reason to talk about the quality of prostheses. Only suitable materials that have undergone research and do not cause allergic reactions are used in production. And they must be biocompatible with human tissues. This minimizes the risk of rejection. In addition, a mandatory property of materials is resistance to wear, especially if the knee joint is undergoing prosthetics. An important advantage of American prostheses is their service life. The warranty is 20 years, sometimes they are preserved for another 5-10 years. And their cheaper analogues last only 5-10 years.

US scientists have developed a robotic system that, with the help of two doctors, performs joint replacement surgeries with greater precision than conventional instruments.

Description of the mechanism

Hip endoprostheses are more complex in design than others. It includes a stem inserted into the bone, a socket and a head, which together form a rotation unit, just like a healthy joint. Types of prostheses are divided according to the type of material from which the head and liner are made: metal-polyethylene, ceramic-metal, etc. Many variations are made, and among them, the one suitable for each case is selected. But it is possible to create a sample in accordance with individual measurements using 3D technology.

For minor lesions of the knee joints, unicondylar semi-prostheses are used. They replace only the affected part without damaging ligaments and muscles, and preserve their own bone tissue. For complete joint replacement, endoprostheses with a movable platform and connected ones are used, parts of which even serve as ligaments.

Product range

The American company Zimmer remains the world leader. They produce products for partial and complete replacement of joint tissues. The company has several of the following prosthetic systems:

• NexGen - includes a hinge mechanism that takes 95% of the load. It is made with a movable platform that ensures comfortable movement.
• Continuum is a hip prosthesis that helps to completely accurately recreate the anatomy of the pelvis.
• Gender - Zimmer Gender Solutions endoprosthesis is manufactured taking into account the individual structural characteristics of the male and female body. And the Gender Patello-Femoral Joint series is used for operating on patients with osteoporosis of the joints at a young age.
• Persona Knee - developed by scientists based on laboratory research to match the parameters of the vast majority of patients.

Zimmer produces prosthetics for different joints, in different fixation methods and materials.

The Biomet concern (“Biomed”) specializes in the field of traumatology, dentistry and orthopedics and produces the following endoprosthetic systems:

• Biomet ReCap is a total hip replacement with a wedge-shaped metal part that can withstand heavy loads.
• Vanguard is a knee prosthesis, part of which contains vitamin E.
• Dual Mobility - allows you to restore full mobility to the hip joint, is characterized by high survival rate and strong attachment to the patient’s bone tissue.
• Biomet AGC - available in two variations: with replacement and preservation of the cruciate ligament. The material used is durable polyethylene.

Zimmer and Biomet merged production 4-5 years ago, and in the future it is planned to create new series of endoprostheses. Stryker and DePuy Synthes manufacture components for prosthetics used in all types of surgical procedures. These products also belong to the quality segment. It is recommended to purchase products from American companies, since such an investment in health pays off in longevity.

Endoprosthetics (arthroplasty) of the hip joint- surgery to replace a joint with an artificial one.

Joint replacement is one of the most effective ways to combat severe joint pain and restore its mobility.

PRINCIPLE OF OPERATION OF THE HIP JOINT

The hip joint is like a ball in a socket. The socket of the hip joint is called the acetabulum. The head of the femur rotates along the concave surface of the acetabulum.

In a hip replacement, the acetabulum consists of a metal shell with a plastic or metal lining. The shaft of the prosthesis is inserted into the thickness of the femur, and the head of the artificial prosthesis is inserted into the acetabulum.

MODERN HIP PROSTHETICS

The goal of hip replacement is to eliminate pain and restore joint function with minimal complications.

Hundreds of thousands of prostheses for replacing large joints are produced annually, and they are constantly being improved and new designs are developed. The most famous manufacturers of artificial joints are companies from the USA and Switzerland, such as Zimmer, DePuy J&J, Biomed.

Titanium and modern composite materials are widely used in the production of artificial hip joints.

There is currently no single best material or implant that is suitable for all patients. The most suitable type of prosthesis should be selected by an orthopedic surgeon.

A modern hip joint prosthesis meets the following requirements:

Requires a small surgical incision for installation

Highly resistant to wear

Protects the bone in the acetabulum

Provides good range of motion

Has a diameter of the femoral head close to natural

Allows the surgeon to change the length of the limb

The hip joint belongs to the category of spherical osteochondral formations and consists of a spherical head of the femur, which slides along the inner surface of the cup-shaped acetabulum of the pelvic bone.

Each element of the endoprosthesis can have different sizes, which allows it to be completely adjusted to the patient’s physique and body weight.

In some models of endoprostheses, the stem and head are a single unit. Other implants are modular, or prefabricated, allowing for a greater level of fit to the patient's individual needs.

Currently, the stem of most hip replacements is made of titanium or cobalt-chromium alloys. Metal legs have a variety of shapes, and some of them are covered with porous material, which allows bone tissue to grow into the endoprosthesis.

The head of the femoral component is made of cobalt or chromium based alloys or ceramic materials (aluminum or zirconium oxide). The surface of the head is carefully polished, which ensures its easy sliding inside the acetabular component of the endoprosthesis.

The acetabular component is made of metal, ultra-high molecular weight polyethylene, or polyethylene reinforced with metal elements.

The total weight of all components of the hip joint endoprosthesis is approximately 400-500 g, depending on the required implant size.

All materials used in total hip replacement have four common characteristics:

Biocompatibility. Compatible with human tissues. The materials do not cause local or systemic rejection reactions from the body.

Resistant to corrosion, destruction and wear. Consequently, endoprostheses retain their shape and functionality for a long time. Resistance to wear is especially important for maintaining normal joint function and preventing further destruction of bone tissue, which can occur under the influence of tiny decomposition products when the components of the endoprosthesis rub against each other.

Correspondence of the mechanical characteristics of materials to the biological structures that they replace. Thus, sufficient strength of the materials allows the endoprosthesis to withstand weight loads, flexibility ensures resistance to pressure, and smooth surfaces allow the components to slide relative to each other without any obstacle.

Compliance with the highest quality standards. High standards in the manufacture of endoprostheses and quality control are combined with acceptable price parameters.

The most complete answers to questions on the topic: “biomed hip joint prosthesis.”

1. Indications and contraindications
2. Buy a hip prosthesis
3. Dislocation of the hip prosthesis
4. Zimmer hip prostheses
5. Cost of a hip prosthesis

Hip replacement is practiced for those patients whose natural joint, for a number of reasons (illness, injury), can no longer function normally. With the help of these artificial joint analogues, it is possible not only to relieve the patient from unpleasant symptoms of diseases, but also to completely restore his former motor activity.

Modern endoprostheses have the same external structure as a regular hip joint. They perform identical functions and can withstand quite a large load.

In most cases, the selection of an endoprosthesis before surgery is carried out by the attending physician, who takes into account many criteria, namely:

• person's weight;
• patient's age;
• a specific diagnosis that led to limited mobility in the joint and advanced disease;
• a person’s tendency to all kinds of allergic reactions.

It should be noted right away that it is impossible to determine “by eye” which endoprosthesis is better, because in this case it is necessary to take into account not only the working mechanism of the implant, but also its manufacturer and, without fail, the materials.
Fortunately, modern endoprostheses can be quite different, which provides a wide range of choices.

Important! According to doctors, high-quality endoprostheses must be manufactured by trusted manufacturers, have a complete set and a perfect operating mechanism. At the same time, experts note that such a product will also have a fairly high cost. According to the quota, one should not hope to install a high-quality product.

Every year, hip replacement surgery is performed in thousands of quantities. To understand its outcome and general impressions of such a surgical intervention in more detail, you can view patient reviews:

The price in Moscow for hip replacement is determined by the following factors:

1. The specific clinic where the procedure will take place.
2. Surgeon's qualifications.
3. Type of anesthesia used.
4. The complexity of surgical intervention and the goals that doctors will set for themselves.

Also, a large role in the cost of such an operation is played by the type of endoprosthesis selected and what kind of operation it will be (primary joint replacement or revision, which is carried out when complications develop). On average, this surgical intervention in Moscow will cost from 260,000 rubles. If the procedure is practiced in elite private clinics, then the operation will cost much more.

This is what the ceramic components used in hip replacements look like. In the bottom row there are the so-called “heads”, in the top row there are “cups”.

Attention! One of the highest quality and at the same time expensive materials for an endoprosthesis is ceramics, the price of which will be quite high. It should be understood that the lifespan of such implants can reach up to thirty years, which is considered an excellent indicator.

Ceramic friction pair assembly.

In order for subsequent rehabilitation to be as easy as possible, even before the operation a person must successfully choose the type of endoprosthesis for himself.

Particular care must be taken in selecting prostheses in case of illness, because the implant, after installation, should not only provide the possibility of motor function of the joint, but also minimize the inflammatory process.

There are these types of prostheses (based on materials) that are installed by surgeons today:

1. Metal + metal. If installed successfully, they can theoretically last up to ten years. Despite this, due to the fact that the metal can be toxic to the body, in some countries it is prohibited to use prosthetics that were made from it. It is recommended to install metal prostheses for overweight men who lead an active lifestyle. Metal implants are contraindicated for women planning pregnancy.
2. Metal + polyethylene. It is advisable to use these types of prostheses for people who lead a moderate lifestyle and do not practice sports. Unfortunately, due to pronounced friction, such prostheses need to be replaced after ten years.
3. Ceramics + ceramics. This is an ideal option for young patients. They move well and do not irritate the joint tissue. Unfortunately, ceramic products are almost twice as expensive as conventional metal dentures.
4. Ceramics + polyethylene. This is the most affordable, but also the highest quality type of prosthesis. Its advantage lies in the ceramic head, which practically does not wear out, and the polyethylene cup, which, although it wears out, perfectly absorbs the same as healthy human joints.

As hard as ceramics is, it is also brittle. In the photo you see the result of a fracture of the ceramic head of the hip joint.

The most frequently used friction pairs of endoprostheses, from left to right: metal-polyethylene, ceramics-polyethylene, ceramics-ceramics.

In addition, recently the following types of endoprostheses are often used:

1. Titanium. This is a completely metal prosthesis, which is used for superficial as well as combined endoprosthetics. Despite its durability, this type of implant often provokes inflammatory reactions in the joint.
2. Biopolar This type of prosthesis is intended for installation in patients who have suffered a femoral neck fracture. They are usually older people. The design of the bipolar prosthesis has a double movement unit in the head. Thanks to this, even older people with limited physical activity after surgery can begin to walk again.
3. Liquid prosthesis to restore cartilage functions. This type of prosthesis is used in the treatment of arthrosis, which affects the cartilage tissue of the joint. At the same time, the patient is injected with drugs based on hyaluronic acid, which fill the cavity of the diseased cartilage. Unfortunately, liquid prosthetics will not be effective if bone tissue is damaged.

The photo shows two bipolar endoprostheses without a femoral component. If you look closely, you can see two axes of movement and, accordingly, two planes of friction. The porous surface eliminates the need for cement during installation.

Hip joint, prosthesis: price

The minimum cost of a hip joint from foreign manufacturers is $650. In Moscow, you can order this type of joint either directly from the company or from the manufacturer’s representatives.

Moreover, even before purchasing an endoprosthesis, a person must specifically know what specific material the product should be made of (ceramic, titanium prosthesis, etc.).

Indications and contraindications

Coxarthrosis of the right hip joint. Complete absence of joint space.

The main indications for which joint replacement surgery may be required are:

• arthrosis and its varieties (coxarthrosis, osteoarthritis);
• oncological pathologies of the hip bone;
• dislocation or fracture of the femoral neck;
• arthritis, including that which developed after a previous injury;
• necrosis of the head of the femur;
• improper fusion of the hip joint;
• joint dysplasia (congenital form).

Biomet is a North American company headquartered in Warsaw, Indiana. This international organization was founded in 1977. It specializes in the production of medical products in the field of traumatology, orthopedics and dentistry. The initial product produced by this company was a hip replacement.

Today, the company produces endoprostheses for joints, devices for eliminating fractures and diseases of the skeletal system, as well as diagnostic equipment. Representatives of the organization operate in dozens of countries on different continents of the planet. In clinics in the Czech Republic, Biomet prostheses are used along with other manufacturers.

Basic composition of endoprostheses

The medical company Biomet is a world leader not only in the production of joint endoprostheses, but also in the manufacture of advanced osteoplastic materials. Each of the developer’s products is made taking into account the characteristics of the patient’s anthropotomy.

Bi-Metric hip joint prostheses. It is a complex of elements made of chromium-cobalt alloy, which is implanted into bone tissue and takes root with 100% probability, which is an unprecedented result.
Hip joint prostheses of the ReCap system. The devices of this complex have excellent adhesion to the bone thanks to a special technology combining titanium coating and a polymer layer.
Complexes of general knee joint prosthetics of the Vanguard system. Made from synthetic material of increased strength and wear resistance. They have the ability to install joint elements of any size.
Discovery Elbow Prosthetic Systems. They are devices equipped with adducting hinges and have the ability to replace the entire elbow joint.
Comprehensive shoulder joint prostheses. Used for partial or total joint replacement.

• Fixing complexes for parts of bone tissue.
• Instruments and materials used in traumatology.

The work of Biomed scientists and engineers has made it possible to develop innovative technologies for carrying out work and produce advanced medicinal materials. These conditions contributed to the company occupying its niche in the global market in the field of prosthetics. Today, many clinics and medical centers use the developments of this company.

Types and main parameters of hip endoprostheses Biomed

Avantage Dual Mobility Hip System

This system was developed by Biomet in 1998 for patients who are at risk of hip dislocation and experience regular pain leading to complete immobilization. A device is used to replace the acetabulum, which eliminates pain and puts the patient back on his feet in a fairly short time.

The prosthesis of this company has an extended service life and increased wear resistance to loads compared to analogues from other manufacturers.

Advantages of the Dual Mobility endoprosthesis:

• Installation of this device allows the hip to abduct in a range of 142 degrees. The strength of the device will allow it to withstand the loads necessary for all types of movement.
• After implantation of this device, the patient will be able not only to abduct, but also to flex the hip within 170 degrees. This will allow you to fully use your limbs.
• The design of the prosthesis best suits the patient’s anatomical parameters, which facilitates comfortable and rapid adaptation of the body to this implant.
• Excellent survival rate in 98% of cases.
• Cementless fixation method. Provides good attachment of the prosthesis to the patient’s bone tissue and performs well during planned replacement of the device.

The use of the Dual Mobility hip endoprosthesis allows its user to quickly restore their functionality and once again experience the joy of the full range of movement necessary for leading an active life. The quality of the material from which this device is made is as close as possible to the characteristics of the natural tissues that make up the joint. This helps to preserve the natural anatomy of movement of its constituent elements.

ReCap

The ReCap total endoprosthetics system provides the entire range of all possible movements of the hip parts. Through the use of new technological approaches in the production of components of this device, absolute precision in polishing and matching of interacting elements of the prosthesis was achieved.

The prosthesis includes the following parts:

• A cup that replaces the acetabulum of the pelvic bone. Made from polymer material.
• The head of the prosthesis is a spherical part that imitates the head of the femur. Made from metal and coated with polymer material.
• The wedge-shaped stem replaces the neck and part of the femur. It is made of metal, as it can withstand heavy loads.

The prosthesis can be fixed to the bone tissue using special cement or using fastening devices. Due to its high rotational ability, the prosthesis transfers the load on the femur well and has a wide range of motion.

Knee endoprostheses Biomed

Vanguard prostheses

This system is used to perform knee replacement surgery. Thanks to the use of innovative technologies and materials, it meets all modern standards and requirements for medical operations. The prosthetic system consists of the following components:

• the femoral part, preserving its anatomical character;
• a structural element simulating part of the tibia;
• locking insert impregnated with vitamin E.

Attachment to the bone is made using a cementless method. The device allows for bending up to 155 degrees, which allows the patient to move on to everyday life without restrictions, and also provides the opportunity for sports.

AGC prostheses

They are total knee replacement systems. The system was developed in 1983, and includes the use of advanced technologies that fully take into account the anatomical shape of the human body.

The system includes the following structural parts:

• tibial element;
• patella;
• insert.

There are the following types of AGC system prostheses:

• prostheses preserving the cruciate ligament;
• prostheses with cruciate ligament replacement.

All components are made of special polyethylene, which has increased strength and wear resistance using compression molding technology. This type of activity allows you to obtain a perfectly flat surface and a high-density material structure.

Service life of Biomet endoprostheses

Clinical studies conducted over a ten-year period by various authorities showed that the survival rate of Biomed endoprostheses was 98%. The average service life of the company's prostheses reaches twenty years. The technologies of this international manufacturer have become the gold standard in the production and application of prosthetic devices. All this was made possible thanks to the constant improvement of production processes and the invention of new materials for prosthetic components.