Cartilage damage in the knee affects the articular cartilage of the knee joint and is one of the most common causes of knee pain. The cartilage protects the joint surfaces and ensures that the joint can move smoothly. If cartilage damage occurs, it can lead to discomfort, swelling, and, in the long term, osteoarthritis.
Knee cartilage damage is often caused by improper weight-bearing, misalignment, or acute traumatic cartilage injury. Osteochondrosis dissecans or damage to the underlying bone may also be responsible. In orthopedics, cartilage damage in the knee is diagnosed using MRI, X-rays, and clinical examination.
Treatment options range from conservative therapy with hyaluronic acid to surgical procedures such as microfracturing or arthroscopy.
What is knee cartilage damage?
Knee cartilage damage occurs when the protective cartilage is damaged or worn down. Affected patients suffer significantly from the symptoms, as they experience severe pain when walking and running.
The cartilage in the knee covers the ends of
- of the thigh bone (femur) and
- the shinbone (tibia), and
- the kneecap (patella).
This layer of cartilage, known as articular cartilage, acts as a shock absorber, enabling smooth movement in the knee joint.
Injuries, chronic overuse, and age-related wear and tear damage the cartilage, causing the bones to rub against each other. Over time, this leads to painful knee osteoarthritis. The term refers to the condition of the cartilage. The inflammatory disease resulting from this wear and tear is known as arthritis.
Symptoms of Cartilage Damage in the Knee
The severity of the symptoms depends on the condition of the cartilage. Typically, those affected experience pain in the knee joint area. The intensity of the symptoms varies. Many patients initially experience only mild pain, which worsens over the course of several years. In advanced stages, those affected complain of severe pain.
Patients with arthritis, in particular, often report stabbing pain and a feeling that the knee is “locked.”
In addition, there is swelling—which indicates inflammation—and a general sense of discomfort. These symptoms make movement difficult and significantly limit the patient’s mobility.
Occasionally, patients hear cracking or grinding sounds when they move their knee. Doctors refer to this phenomenon as crepitation. The sounds occur when the damaged cartilage surfaces inside the joint rub against each other. Patients describe this sensation as extremely unpleasant.
How does cartilage damage in the knee develop?
Common causes of cartilage damage in the knee joint include injuries or traumatic events. A sudden impact or an accident in which the knee twists can damage the cartilage. This occurs, for example, in sports injuries, falls, and other unintentional impacts. Direct damage to the cartilage tissue or long-term instability in the knee joint resulting from such injuries can lead to cartilage degradation.
Repetitive stress and certain movement patterns or sports place excessive strain on the joint and also cause cartilage damage. People who frequently bend their knees, jump, or perform other high-impact movements—whether for work or as part of their athletic activities—are particularly at risk.
Cartilage damage often results from age-related wear and tear or degenerative changes. As we age, the cartilage in the knee loses elasticity and thickness, increasing the risk of damage. At the same time, the cartilage layer’s natural ability to regenerate decreases with age, making recovery from injuries more difficult.
Factors that increase the risk of cartilage damage include:
- being overweight
- genetic predisposition
- a pre-existing cartilage disorder or joint misalignment
Methods for Examining and Diagnosing Cartilage Damage in the Knee Joint
The most common method for diagnosing cartilage damage in the knee is a clinical examination, during which the doctor examines the knee joint. This allows the doctor to identify
- swelling,
- restricted movement, and
- other characteristic signs of cartilage damage
. The doctor asks the patient about their medical history, athletic and occupational activities, and any past accidents.
Imaging techniques such as magnetic resonance imaging (MRI) confirm the diagnosis. The detailed images help the doctor determine the extent of the cartilage damage so that he or she can develop a personalized treatment plan.
Occasionally, the doctor performs knee arthroscopy. This is a minimally invasive procedure in which the doctor inserts a thin instrument (arthroscope) into the knee joint. The condition of the cartilage and other structures within the joint is displayed live on a monitor. This visualization allows the doctor to fully assess the extent of the cartilage damage. The doctor also has the option of performing minor repairs on the cartilage tissue using the arthroscope.
Treatment Options and Specialists for Knee Cartilage Damage
The type of treatment depends on the extent of the cartilage damage and the symptoms present.
In milder cases, specialists opt for a conservative treatment approach. This includes
- physical therapy,
- specific exercise programs, and
- pain management.
The goal of the conservative treatment approach is to prevent or slow the progression of the disease. To achieve this, patients strengthen the muscles around the knee and improve the stability of the knee joint. In advanced cases, doctors often recommend surgical treatments. These include arthroscopic procedures such as cartilage shaving and cartilage repair.
In some cases, a cartilage transplant or the implantation of a cartilage substitute is necessary. The goal is to replace or repair the damaged tissue.
Various specialists are involved in the treatment of cartilage damage. An orthopedic surgeon or sports medicine specialist is usually the first point of contact when symptoms in the knee joint arise. Other specialists are involved in surgery, such as an anesthesiologist and a knee surgeon.
Course and Effectiveness of Treatment Methods for Knee Cartilage Damage
The prognosis for the course of the condition and the effectiveness of treatment measures depend on
- the severity of the cartilage damage in the knee and
- the individual’s state of health
. In the early stages, a conservative treatment approach has proven effective. Conservative therapy cannot permanently halt the progression of cartilage damage. However, it does help maintain the joint’s functionality for many years.
In some cases, conservative treatment significantly alleviates symptoms, which is accompanied by increased range of motion.
Surgical procedures, particularly cartilage transplantation, often noticeably improve patients’ quality of life. However, cartilage damage is a chronic condition. Therefore, doctors often try to alleviate symptoms rather than address the underlying cause.
Summary and Conclusion
Cartilage damage in the knee causes pain and limited mobility. Those affected suffer from symptoms such as
- knee joint pain,
- swelling, and
- limited mobility.
Knee cartilage damage is diagnosed through clinical examinations and imaging tests. In some cases, the doctor performs an arthroscopy to determine the extent of the damage.
Treatment options vary depending on the severity of the cartilage damage. In milder cases, the doctor prescribes conservative therapies to strengthen the muscles around the knee. In advanced cases, surgical procedures such as cartilage debridement, cartilage repair, or cartilage transplantation may be considered.
If a doctor diagnoses the condition early, conservative therapies can slow its progression—thereby preserving the knee’s function. Surgical procedures help alleviate symptoms and restore patients’ quality of life and freedom of movement.
FAQ
What is knee cartilage damage?
Knee cartilage damage is damage to the articular cartilage in the knee joint. This damage to the cartilage layer can cause the affected joint to develop pain and restricted movement.
How does knee cartilage damage occur?
When cartilage damage occurs, misalignment, improper weight-bearing, or traumatic cartilage injury often play a role. Bowlegs or knock-knees, axial misalignments of the lower extremities, or damage to the underlying bone can also cause cartilage damage.
What are the symptoms of cartilage damage?
The typical symptoms include pain in the knee joint, swelling, and limited mobility. In cases of advanced cartilage damage, osteoarthritis may also develop. Some cartilage defects initially cause few symptoms and are only detected during a clinical examination.
How is cartilage damage treated?
Depending on the defect, cartilage damage is treated conservatively or surgically. Conservative therapy includes physical therapy, hyaluronic acid, and weight-bearing reduction. For more extensive cartilage damage in the knee, surgical options such as arthroscopy or microfracturing may be considered.
What surgical options are available for cartilage damage?
Cartilage damage can be surgically treated during arthroscopy. During the procedure, small holes are drilled into the bone to stimulate the growth of new cartilage cells. In addition, cells harvested from the patient’s own body can be cultured and implanted into the damaged cartilage as a replacement.
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Sabine Schneider
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Sabine Schneider – medical author: Explore expert articles and medical expertise in the Leading Medicine Guide.
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