About Knee Osteoarthritis
The pathophysiology of knee osteoarthritis (OA) involves the degradation of articular cartilage, synovitis (inflammation of the synovial membrane), and changes in subchondral bone. While the exact causes are not completely understood, several non-modifiable and modifiable risk factors have been identified.
Non-modifiable risk factors (factors a person can’t change or control) for knee OA include:
- Age: Advanced age is heavily associated with the development of knee OA.
- Gender: People assigned female at birth have a higher risk, particularly past age 50 years.
- Genetics: Having a family history of knee OA increases the risk.
Modifiable risk factors (factors a person possibly can change or control) for knee OA include:
- Joint injury or overuse: Both injury and overuse, such as repetitive motions or stress on the joint, can damage the joint and increase the risk of knee OA.
- Obesity: Excess body weight places extra strain on the knees and hips, increasing the risk.
- Other joint involvement: Having knee OA in one joint increases the risk of developing it in another joint.
- Muscle weakness: Weakness in the muscles surrounding the knee joint may influence joint load and contribute to the onset of knee OA.
It's important to remember that these risk factors increase the likelihood of developing Knee OA but do not guarantee its development. Lifestyle modifications and appropriate medical care can help manage these risks.
Common symptoms of knee osteoarthritis include:
- Joint pain and stiffness in the knee.
- Cracking or grinding noise in the knee: Due to the loss of cartilage in the joint, a person may notice a crackling or crunching noise when they move the knee.
- Joint instability: A weakening of the tissues surrounding a kneee can cause looseness or decreased function in the knee.
- Firm, knobby swelling of the knee: This occurs due to bone spurs, also known as osteophytes, which typically grow slowly over time.
As knee OA progresses or becomes more severe, additional symptoms may occur:
- Increased pain or swelling in the knee, including at rest or minimal physical activity.
- Difficulty bending the knee and limited range of motion.
- Locking, creaking, clicking, snapping, or grinding sensations in the knee.
- Feeling like the knee is weak or buckling.
- Decreased mobility and ability to move freely.
Remember, these symptoms can vary from person to person. It's important to consult with your healthcare professional for an accurate diagnosis and appropriate management plan.
To diagnose knee osteoarthritis, doctors may perform the following examinations, tests, and procedures:
- Medical history: The doctor will ask about symptoms, pain intensity, duration, and activities that are difficult due to pain or decreased mobility.
- Physical examination: The doctor will examine the knee joint, check for swelling, reduced movement, tenderness, and grating sounds during movement. The doctor may check how much you can move your knee and your gait (how you walk).
- X-rays: These can provide detailed images of the knee joint and help identify common features of osteoarthritis such as bony spurs, narrowing of space between bones, and possible calcium deposits.
- MRI (Magnetic Resonance Imaging): This non-invasive test provides excellent soft tissue contrast and allows accurate assessment of the knee joint's structure. It can help detect bone marrow edema, joint ligament issues, synovium problems, and cartilage injury.
Other examinations and tests may be recommended based on individual factors. Remember to consult with your doctor about which examinations, tests, and procedures are suitable for your individual situation.
The goals of treatment and treatment options for knee osteoarthritis include:
- Reducing pain and other symptoms: This can be achieved through various methods, including
- Medications such as nonsteroidal anti-inflammatory drugs (NSAIDs) help to alleviate pain and inflammation. Short-term opioid analgesics may be used for severe pain; however generally not recommended due to tolerance (need for higher doses over time), side effects and addiction potential.
- Therapies like physical therapy, low-level laser therapy (LLLT), or occupational therapy can also be beneficial in managing pain and improving joint function.
- Improving joint function: Physical therapy plays a crucial role in improving joint function by incorporating exercises that focus on range-of-motion, strengthening, balance, and agility. These exercises help to increase flexibility, muscle strength, and endurance, ultimately enhancing joint function.
- Stopping the disease from progressing: While there is no cure for knee osteoarthritis, certain health behavior changes can help slow down the progression of the disease. These changes include weight management to reduce stress on the joints and avoiding activities that increase joint load or cause pain.
- Maintaining a health-related quality of life: By following a well-rounded exercise program, managing weight, and utilizing braces or orthotics as prescribed by a healthcare professional, individuals with knee osteoarthritis can maintain their quality of life and prevent disability.
For knee OA is severe and debilitating, surgery may be recommended. Surgery includes cartilage grafting and partial or total knee replacement.
It's important to note that medication types and therapeutic procedures should be discussed with a healthcare professional before initiating any treatment. Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Medication side effects can occur. Check with your health care professional or read the information provided with your medication for additional side effect information.