Knee Cartilage Injury

Cartilage is a tough but flexible connective tissue found in many areas of the body, including the knee joint. In the knee, cartilage exists in two primary forms:

Articular Cartilage

This smooth, white tissue covers the ends of bones within the joint, including the femur (thighbone), tibia (shinbone), and patella (kneecap). It allows the bones to glide smoothly against each other, reducing friction and distributing joint loads during movement.

Meniscal Cartilage

The menisci are two crescent-shaped structures located between the femur and tibia. Each knee contains a medial (inner) and lateral (outer) meniscus. These structures act as shock absorbers, stabilizing the knee and protecting the articular cartilage from excessive stress.

Damage to either type of cartilage can lead to pain, swelling, and impaired function, with long-term consequences if not properly treated.

The symptoms of a knee cartilage injury vary depending on the severity and location of the damage. Common signs include:

• Pain: A dull ache or sharp pain in the knee, especially during weight-bearing activities or after prolonged periods of inactivity.
• Swelling: Inflammation around the knee joint, which may develop immediately or over several hours following the injury.
• Stiffness: Difficulty bending or straightening the knee due to limited joint mobility.
• Locking or Catching: A sensation of the knee getting “stuck” during movement, often caused by loose cartilage fragments within the joint.
• Instability: A feeling that the knee may give way or fail to support weight, particularly during activities requiring pivoting or sudden direction changes.

If these symptoms persist or worsen, it is essential to seek medical evaluation to prevent further damage and complications.

Knee cartilage injuries can occur for a variety of reasons, including:

1. Trauma: Acute injuries resulting from direct impact or high-force stress, such as a fall, motor vehicle accident, or sports-related collision, can damage cartilage.
2. Repetitive Stress: Overuse or repetitive movements, especially in athletes or individuals with physically demanding jobs, can wear down cartilage over time, leading to degeneration or tears.
3. Sudden Twisting or Pivoting: Rapid changes in direction or awkward landings, common in sports like soccer, basketball, and skiing, can injure the meniscus or articular cartilage.
4. Aging and Degeneration: With age, cartilage can become more brittle and susceptible to wear, increasing the risk of osteoarthritis and cartilage injury.
5. Pre-existing Conditions: Certain conditions, such as joint misalignment, ligament injuries, or inflammatory arthritis, can contribute to cartilage damage by placing additional stress on the knee.

Accurate diagnosis is essential for effective treatment and recovery. Dr. Connor Ziegler employs a thorough approach to diagnosing knee cartilage injuries, which includes:

1. Medical History: The evaluation begins with a detailed discussion of the patient’s symptoms, activity level, and any history of trauma or overuse. This helps determine the potential cause and extent of the injury.
2. Physical Examination: Dr. Ziegler performs a comprehensive examination of the knee, assessing for tenderness, swelling, range of motion, stability, and signs of locking or catching. Special tests, such as the McMurray test or Thessaly test, may be used to evaluate meniscal injuries.
3. Imaging Studies:
   • X-rays: While cartilage does not appear on X-rays, these images help identify any bone abnormalities or joint misalignment that may contribute to the injury.
   • Magnetic Resonance Imaging (MRI): An MRI is the gold standard for visualizing cartilage injuries, as it provides detailed images of both the menisci and articular cartilage, along with surrounding ligaments and soft tissues.
   • Ultrasound: In certain cases, ultrasound may be used to evaluate soft tissue damage and detect joint effusions.
4. Arthroscopy: For complex cases or when imaging is inconclusive, Dr. Ziegler may recommend arthroscopy—a minimally invasive surgical procedure that uses a small camera to directly visualize the joint and assess cartilage damage.