Professor Karl Philipp Kutzner, MD, has built up remarkable expertise in the field of orthopedic surgery and is regarded as a specialist in hip and knee joint replacement. His many years of service as a senior registrar in the Department of Orthopedics at St. Josef’s Hospital in Wiesbaden and his successful habilitation in orthopedics at Johannes Gutenberg University Mainz underscore not only his professional competence but also his deep commitment to this medical discipline. As an expert in hip and knee arthroplasty, Prof. Dr Kutzner has earned an excellent reputation. With the opening of the Endoprotheticum Rhein-Main, he has established a practice that not only offers excellent medical care but also creates a trusting atmosphere for personalized care. His specialization makes him a sought-after point of contact for patients with joint problems, and he supports them from consultation through to treatment with great empathy and expertise.
Prof. Dr Kutzner places great emphasis on conservative treatment methods, even with his surgical focus. He stresses the importance of comprehensive care that goes beyond the surgical procedure. His range of treatments extends from minimally invasive procedures to partial joint replacement and revision surgery, enabling him to offer a wide array of treatment options. Prof. Dr Kutzner has also specialized in partial knee replacement, which benefits many younger patients with osteoarthritis. His approach aims to provide personalized solutions that contribute to an active and pain-free life. With his practice at the Endoprotheticum Rhein-Main and the private Lilium Clinic in Wiesbaden, Prof. Dr Kutzner offers first-class medical care in a modern setting.
He takes time for every patient and tailors treatment individually to ensure not only durability and function, but also freedom from pain and high patient satisfaction. Prof. Dr Kutzner stands out not only for his medical expertise but also for his empathetic and dedicated commitment to the well-being of his patients, helping them to achieve an improved quality of life. The editorial team at Leading Medicine Guide once again had the opportunity to speak with knee specialist Prof. Dr Kutzner and wanted to learn more about partial knee replacement.
The knee joint is an impressive structure that is subjected to considerable strain on a daily basis. Osteoarthritis is a painful condition that attacks and wears down the joint cartilage, ultimately leading to pain, stiffness and restricted mobility. This condition affects a considerable number of people worldwide and can significantly impair quality of life. In cases of advanced osteoarthritis, particularly where only certain areas of the knee are affected, partial knee replacement can be an effective solution. Unlike total joint replacement surgery, partial joint replacement only replaces the damaged or worn-out part of the knee with an implant, while the healthy part of the joint is preserved. This surgical technique aims to relieve pain, restore range of motion and improve mobility.
The first step is diagnosis.
The diagnosis of knee osteoarthritis and knee joint problems typically begins with a thorough examination by the doctor, who makes an initial assessment based on symptoms and a physical examination. Various diagnostic procedures are used for confirmation and precise assessment. X-rays are often the first diagnostic tool used to detect bone changes, bone spurs and the space between the bones. MRI scans provide detailed images of the soft tissues in the knee, including cartilage and ligaments, and help to assess the condition of the joint more accurately. “Particularly when considering a possible partial knee replacement, one should always take the time for a thorough diagnosis. In addition to standard X-rays and MRI, there are so-called weight-bearing X-rays, which allow the progression of osteoarthritis in the individual knee compartments to be clearly identified and assessed when they are under stress. This means the images are taken under load. This equipment for such a diagnostic procedure is essential for determining the best course of treatment. I’m delighted to have had this option for several months now,” Prof. Dr Kutzner begins our conversation on a positive note.
Blood tests can identify inflammatory markers or other factors that may be linked to osteoarthritis and provide additional information. Various methods complement one another to enable a precise diagnosis and determine the severity of knee osteoarthritis, which ultimately forms the basis for sound treatment decisions.
Partial joint replacement is not yet sufficiently established.
“Unfortunately, partial knee replacement is still somewhat neglected in some quarters, and total knee replacements are generally preferred, even though this may not be necessary at all. Some colleagues simply have too little experience with partial knee replacements. Knee replacements often fail to achieve ideal results, and at least 10% of patients are dissatisfied with the outcome of the operation. In my view, this is usually due to an incorrect indication. For example, if a 90-year-old lady is fitted with a knee prosthesis, there is a very good chance that she will be satisfied with it, as it can significantly improve her previous limitations and allow her, for instance, to move around her home pain-free once again. However, if we operate on a 60-year-old working tradesman with a total knee replacement, who may also work on his knees, he may not be happy, as it is highly likely that he will not be able to kneel again with a total prosthesis and may perceive the prosthesis as a foreign body. Ultimately, we have a certain proportion of patients whom we must treat with great care, particularly younger or very active and working patients. Here, it is essential to explain clearly exactly what activities will only be possible to a limited extent with a knee prosthesis,” explains Prof. Dr Kutzner. It is therefore very important that an accurate diagnosis and a careful assessment are carried out by the treating doctor to determine whether a partial knee replacement might not be the better option.
The main indication for the use of a partial knee replacement is degenerative joint disease.
“If there is no misalignment, age-related degenerative disease usually spreads throughout the entire knee over the years. However, it is also the case that a young person, say aged 20, can injure their medial meniscus while playing football. If this is then operated on, a partial removal is often performed. Furthermore, the tear may have caused damage to the inner side. An injured meniscus is then considered a form of pre-osteoarthritis, which, later in life, leads to signs of wear and tear developing precisely at this point. However, the wear and tear now occurs only on the inner side of the knee, i.e. where the meniscus is located. The osteoarthritis is limited to one part of the knee joint. Even if people suffer from misalignments such as bow legs, partial osteoarthritis can develop. For these people, a partial prosthesis may then be an option. “After all, why use a full prosthesis if the rest of the knee is still fine?” argues Prof. Dr Kutzner.
The knee with its three compartments:
The medial compartment covers the inside of the knee and includes the inner part of the thigh bone (femur) and the inner part of the shin bone (tibia). Here, the medial collateral ligament and the meniscus are primarily responsible for ensuring stability. The lateral compartment covers the outside of the knee and includes the outer part of the thigh bone and the outer part of the shin bone. Similar to the medial compartment, the lateral collateral ligament and the meniscus work to provide stability and protection. The patellofemoral compartment is the area between the kneecap (patella) and the front of the thigh bone (femur). This compartment is crucial for the function of the kneecap and its gliding along the femoral groove. Various ligaments, muscles and the anatomy of the kneecap itself influence the stability and function of this compartment.
With a partial joint replacement, only the affected part of the knee is replaced.
“The most common partial knee replacement involves a so-called sled prosthesis, also known as a unicondylar or unicompartmental prosthesis, which covers the affected area like a skid. The advantage of these ‘partial’ solutions is that all other healthy parts of the joint can be left intact. Another important point is the preservation of the knee’s natural biomechanics. As the entire joint is not replaced, and the ligamentous structures remain as they are, the sled prosthesis can help the knee joint retain a more natural range of motion and stability. This generally leads to improved function and greater comfort for patients, particularly during movements and activities of daily living. As a result, patients are often more satisfied. “The advantages and significant benefits of these partial joints in cases of isolated degenerative conditions are gradually being better understood today,” comments Prof. Dr Kutzner on the advantages of a partial joint.
Partial joint replacement, particularly the sliding prosthesis, offers a less invasive alternative to total knee replacement for selected patients with localized knee damage. Despite its advantages, there are potential disadvantages that must be taken into account.
“We cannot always predict with 100% certainty whether residual symptoms will persist following the use of a partial joint replacement, as a large part of the knee remains untreated. This means that if, for example, we operate on a 50-year-old and he receives a partial knee replacement on the inner side of the knee, it is of course possible that by the age of 70 he may gradually develop symptoms on the outer side as well, as signs of wear and tear set in there too. This presents the disadvantage that further surgery may then be required. On the other hand, switching from a partial knee replacement to a total knee replacement is usually possible without significant complications. Of course, there are other reasons for revision surgery in partial knee replacements, such as loosening, wear and tear, or infections. I always recommend a partial knee replacement to younger patients, if possible. For older patients, too, opting for a partial joint replacement may be the better option, as mobility is usually regained more quickly. “The advantage of a partial joint replacement clearly lies in the improved range of motion it offers,” explains Prof. Dr Kutzner.
Every extra kilo of body weight places significantly more strain on the knee joint and the cartilage. This requires in-depth discussion with the patient. Significant excess weight leads to an increased risk of complications, ranging from knee joint surgery right through to rehabilitation.
If osteoarthritis is present beneath the kneecap, there are also options involving mini-implants.
In people suffering from patellar dysplasia, the kneecap (patella) does not glide correctly in the groove of the thigh bone (femur), leading to instability of the kneecap. It is not uncommon for this to lead to isolated osteoarthritis of this patellofemoral joint over the course of a person’s life. Here too, a partial knee replacement can help, explains Prof. Dr Kutzner: “These patients – more often women – sometimes experience considerable pain behind the kneecap, particularly when going down stairs. Here too, some surgeons opt to implant a full knee prosthesis – yet there are actually excellent options available with so-called mini-implants. In this case too, only the compartment behind the kneecap affected by wear and tear is covered with an implant. From a technical standpoint, partial joint surgery is somewhat more demanding and is also covered far less frequently in medical training. Usually, one first learns to perform a total joint replacement before gaining experience with a partial joint replacement. This requires a little more skill and theoretical knowledge. As a specialist knee surgeon, one should be well-equipped in this area, because it is simply a good way to help our patients regain mobility gently.”
Post-operative rehabilitation following a total knee replacement or a partial knee replacement aims to restore the mobility, strength and functionality of the knee.
Following knee replacement surgery, the rehabilitation phase often consists of physiotherapy and exercises to strengthen the muscles around the knee. Exercises to improve flexibility and balance may also be carried out. Rehabilitation lasts from several weeks to months and is often divided into different phases, depending on the healing process and the patient’s individual response to treatment. With partial knee replacement, the rehabilitation period is usually significantly shorter compared to total knee replacement, as less soft tissue and bone are involved. Nevertheless, a similar rehabilitation strategy is followed here too, aimed at improving mobility and strengthening the surrounding muscles.
“With partial joint replacement surgery, a smaller incision is made during the operation than when a total prosthesis is used. The rehabilitation is similar in both cases. The most important thing, however, is that patients with a partial joint replacement generally still feel as though they are standing on their own bones. And if all goes well, you can be back on the sports field after eight weeks. With a total knee replacement, this usually takes considerably longer,” says Prof. Dr Kutzner, emphasising: “By now, every second knee I treat is a sled!”
Exercise is good for natural knee health
“It’s never a good idea to lift heavy weights from a squatting position. Cycling is definitely a knee-friendly sport! Jogging on tarmac is not really recommended. However, the development of osteoarthritis is always influenced by multiple factors. But the most important thing is to keep moving,” recommends Prof. Dr Kutzner, bringing our conversation to a close.
Dear Professor Dr Kutzner, thank you very much for your time and for the insight into the complex structure of the knee joint and the individual options offered by partial knee replacements!
