A swollen knee can be uncomfortable, frustrating, and sometimes worrying, especially if it keeps coming back. While knee swelling is often the body’s natural response to injury or inflammation, persistent or recurring swelling may indicate an underlying condition that requires assessment and treatment.
Understanding knee swelling causes is the first step towards finding the right treatment and preventing ongoing discomfort.
Common Causes of Knee Swelling
Knee Osteoarthritis
One of the most common causes of recurring knee swelling is knee osteoarthritis. As the cartilage within the knee gradually wears away, the joint can become inflamed, leading to pain, stiffness, and fluid build-up.
Swelling may worsen after physical activity or prolonged standing and is often accompanied by reduced mobility.
Meniscus Tears
The meniscus is a piece of cartilage that cushions the knee joint. A meniscus tear can occur suddenly during sport or develop gradually through age-related wear and tear.
A meniscus tear often causes swelling within the first 24 to 48 hours after injury, alongside pain, clicking sensations, or difficulty fully bending or straightening the knee.
Bursitis
Small fluid-filled sacs called bursae help reduce friction around the knee. When these become irritated or inflamed, prepatellar bursitis can develop, causing swelling, tenderness, and pain around the joint.
Repeated kneeling, overuse, or direct trauma are common causes.
Ligament or Tendon Injuries
Sprains, strains, or injuries to the ligaments and tendons surrounding the knee can also result in swelling. This is particularly common after twisting injuries or sporting activities.
Depending on the severity of the injury, swelling may appear immediately or develop gradually over several hours.
When Should You Seek Medical Advice?
While mild swelling may settle with rest, ice, and activity modification, you should seek professional assessment if:
- Swelling persists for more than a few days
- Your knee repeatedly swells without an obvious cause
- You experience severe pain or instability
- The knee locks or gives way
- Swelling is accompanied by redness, warmth, or fever
Early assessment can help identify the underlying problem before symptoms become more severe.
How Is Knee Swelling Diagnosed?
At Alton Pain Clinic, diagnosis begins with a detailed musculoskeletal assessment. Depending on your symptoms, this may include an ultrasound examination to assess the soft tissues, tendons, ligaments, and joint structures around the knee.
Identifying the exact cause of the swelling allows us to recommend the most appropriate treatment.
Treatment Options
Treatment depends on the underlying cause of your knee swelling and may include:
- Activity modification and rehabilitation exercises
- Physiotherapy
- Anti-inflammatory medication
- Ultrasound-guided cortisone injections
- Arthrosamid treatment for suitable patients with knee arthritis
For many patients, ultrasound-guided injections can reduce inflammation, relieve pain, and improve mobility while supporting rehabilitation.
Never Ignore Swelling
Recurring knee swelling should never be ignored. Whether it’s caused by arthritis, a cartilage injury, or inflammation within the joint, obtaining an accurate diagnosis is essential for effective treatment.
If your knee continues to swell or is affecting your daily activities, a professional assessment can help identify the cause and provide a personalised treatment plan to get you moving comfortably again.
This article is intended for informational purposes only and should not replace professional medical advice. If you are experiencing persistent symptoms, please consult a qualified clinician.