Knee
What is the knee made of?
The knee joint is the largest joint in the human body and is made up of three bones, namely the femur, the tibia and fibula, and the patella. The knee joint itself is made up of two joints: the joint between the thigh and lower leg and the joint between the kneecap and thigh.
A rough joint capsule surrounds the entire knee joint and thus retains the synovial fluid in the joint. This fluid is produced by mucosal cells that line the inside of the joint capsule. The synovial fluid serves to nourish the cartilage cells and is responsible for the joint's ability to glide.
How does a knee work?
The movement of the knee joint is very complex and involves a rolling and sliding movement. Mobility is made possible by the appropriate interplay of muscles, ligaments and tendons. Two crescent-shaped discs of connective tissue, known as menisci, are located between the thigh and lower leg bones on the inside and outside of the knee joint. They distribute the load in the joint evenly over the lower leg and act like a buffer or shock absorption system. The smooth articular cartilage covers the entire bone surface inside the joint with a layer approximately five millimetres thick. The very elastic and water-containing tissue enables low-friction, gliding movement. Unlike the underlying bone, the cartilage has no pain receptors. This is why we do not feel any pain when moving if the cartilage is intact.
What treatments do we specialise in?
- Arthroscopic procedures (arthroscopy) for osteoarthritis in the early stages with cartilage smoothing and removal of new bone formations, removal of painful plicae
- Injections of hyaluronic acid, cortisone, autologous blood or use of the so-called cellular matrix (combination of hyaluronic acid and autologous blood)
- Artificial knee joints/knee prostheses (surface replacement, partial or total prostheses)
- Axial correction of the knee with bow legs or knock knees
- Revision of knee prostheses and treatment of a painful artificial knee joint
- Meniscus operations (following meniscus tears or damage); meniscus suturing
- Anterior and posterior cruciate ligament replacement surgery after cruciate ligament rupture
- Treatment of tendon and ligament injuries to the knee
- Operations on the kneecap (patella)
- Cartilage/bone transplantation for cartilage damage
- Second opinion on all knee-related problems
Arrange a consultation appointment
We guarantee rapid, expert clarification and advice as well as treatment using the most modern methods.
Dr Andreas L. Oberholzer is a recognised expert in knee problems and has extensive experience in the field of artificial knee joints.
Book your appointment directly online here or call us on +41 44 388 16 16. You are also welcome to come to us for a second opinion.
Frequently asked questions
What are the most common causes of pain in the knee joint?
In active people, overuse of the ligaments and tendons or inflammation of the bursa often lead to knee problems. Injuries to the meniscus, cruciate ligament or cartilage damage are also causes of knee problems. In older people, signs of wear and tear such as osteoarthritis are usually responsible for knee problems.
Are there risk factors that favour knee problems?
On the one hand, overloading during sport can lead to problems. Quick changes of direction and hard landings after a jump put a particularly high strain on the tendons, ligaments, meniscus and cartilage of the knee. On the other hand, weight also plays a role. You have to imagine that when you are standing, you are putting twice your body weight on your knee. When walking down stairs, the load on the knee joint is even six times the body weight. This means that the more weight, the greater the load on the knee. However, how much a knee can withstand is very individual.
What can you do for your knee as a preventative measure?
Although sport can be a risk factor, it is generally very healthy, as the muscles around the knee are trained and thus stabilise the knee. Sports with guided movements are particularly easy on the joints. These include cross-country skiing in classic style, swimming, cycling or fitness training on equipment. A healthy, varied diet also makes a significant contribution to the prevention of knee problems. It is important for both the cartilage and the synovial fluid.
When do you put too much strain on your knee?
As soon as the ligaments or the inner structure of the knee joint are overstretched, they react with pain or swelling. The pain is perceived very differently and ranges from dull, burning, stabbing to pulling. Pain can occur during movement, during exertion or at rest. A distinction is also made between acute knee pain, which occurs suddenly, and chronic knee pain, which only develops over time. The localisation and type of pain always give us an indication of what the problem might be. Swelling, often combined with instability of the knee, is a possible sign that something is wrong with the ligaments.
The following applies: If knee instability and knee pain dominate everyday life, it is time to clarify and treat these complaints in order to avoid possible consequential damage.
Many athletes suffer from jumper's or runner's knee. What does this mean?
These are two different problems. However, both are preceded by overuse of a ligament. In the case of so-called jumper's knee, it is the ligament of the kneecap that has been overloaded by repeated jumping or abrupt changes of direction. This overloading causes tiny injuries to the tendon at the lower edge of the kneecap. New connective tissue forms nearby, nerves and blood vessels sprout and cause the typical load-dependent pain.
Runner's knee - as the name suggests - mainly affects long-distance runners. The pain that occurs on the outside of the knee is also caused by tendon problems. The tendon plate comes from the pelvis and runs along the side of the thigh to the tibial plateau. Normally, it glides past the knee joint without any problems. With runner's knee, however, it repeatedly rubs against the prominent bones - this strains the tissue and can cause inflammation.
Prolonged knee pain can have a massive impact on quality of life. When is surgery recommended?
The first thing to do is to have the knee problems carefully investigated. Depending on the cause, good results can be achieved with conservative measures, i.e. medication, physiotherapy and breaks in training. However, if the pain persists and the quality of life suffers due to the discomfort, surgery should be considered.
Osteoarthritis is a gradual process with increasing pain. When is a knee prosthesis necessary?
The following also applies here: if the quality of life is severely restricted due to knee osteoarthritis or if everyday life is dominated by pain and uncertainty, you should consider a knee prosthesis. An artificial knee joint can restore freedom from pain and mobility. An artificial joint usually lasts 10 to 15 years. The lifespan of an artificial joint can be limited by the following factors: Obesity, activity, increase in osteoporosis, infections, allergies, instability of the joint and due to accidents.
PD Dr Andreas L. Oberholzer
FMH specialist in orthopaedics and trauma surgery. Areas of specialisation: Knee, hip and foot surgery.