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What’s Behind Your Knee Pain?

17/04/2025

Knee pain is a common issue that affects people of all ages.

The knee, a significant joint in the body, connects the thigh bone (femur) to the shin bone (tibia), while the kneecap (patella) serves as a shield, offering essential protection.

This intricate joint plays a key role in everyday activities like walking, running, squatting, and jumping. As it bears much of the body’s weight and allows a wide range of motion, the knee is particularly vulnerable to injuries and degenerative conditions.

Common Causes of Knee Pain

Pain around the knee is usually caused by:

  • Osteoarthritis
  • Runner’s knee
  • Jumper’s knee
  • Iliotibial band syndrome (IT band syndrome)
  • Bursitis
  • Knee overuse injuries

Arthritis-related joint inflammation:

  • Rheumatoid arthritis
  • Gout
  • Pseudogout

Trauma or acute injuries (often requiring surgical intervention):

  • Meniscus tears
  • Ligament injuries
  • Fractures

Let’s take a closer look below:

1. Osteoarthritis

Osteoarthritis is a degenerative joint disease characterized by the gradual breakdown of cartilage—the protective tissue that cushions the ends of bones.

  • Causes: Develops over time due to wear and tear, but injuries, obesity, and repetitive joint stress can accelerate its onset.
  • Who’s Affected: Common in older adults, but can also occur in younger individuals with a history of knee injuries or repetitive stress.
  • Symptoms: Pain, swelling, stiffness, and reduced mobility.
  • Management: Treatments such as injections to the knee, physical therapy, weight management, medications, and, in severe cases, as a last resort – joint replacement surgery to alleviate symptoms.

It’s best to protect your knees and seek early treatment to ensure they last a lifetime.

2. Runner’s Knee (Patellofemoral Pain Syndrome)

This condition occurs when the cartilage beneath the kneecap becomes irritated.

  • Causes: Overuse, misalignment, or muscle imbalances.
  • Symptoms: Pain around or behind the kneecap, often aggravated by activities such as climbing stairs, squatting, or running.
  • Management: Rest, strengthening exercises, and correcting alignment issues can prevent further irritation.

3. Jumper’s Knee (Patellar Tendinitis)

Tendinitis refers to inflammation or irritation of the tendons, the thick cords that attach muscles to bones.

Patellar tendinitis, or “jumper’s knee,” commonly affects the tendon connecting the kneecap to the shinbone.

  • Causes: Overuse or repetitive motion, particularly in athletes or those engaging in activities like jumping, running, or cycling.
  • Symptoms: Pain, tenderness, and swelling around the affected tendon.
  • Management: Rest, ice, physical therapy, and strengthening exercises can help alleviate symptoms

4. Iliotibial Band Syndrome (IT Band Syndrome)

The iliotibial (IT) band is a thick band of tissue running from the hip to the knee. When it becomes tight or inflamed, it can cause pain on the outer side of the knee.

  • Common In: Runners, cyclists, and athletes who engage in repetitive knee-bending activities.
  • Symptoms: Pain that worsens during activities like running, especially downhill, or after increasing activity levels too quickly.
  • Management: Rest, stretching, and physical therapy can alleviate symptoms.

5. Bursitis (e.g. Pes anserine, Prepatellar)

Bursitis occurs when the bursae—small, fluid-filled sacs that cushion the knee joint—become inflamed.

  • Causes: Repetitive pressure, prolonged kneeling, or direct trauma to the knee.
  • Symptoms: Swelling, warmth, tenderness, and pain, especially during movement or kneeling.
  • Management: Rest, anti-inflammatory medications, and, in severe cases, aspiration of the fluid and corticosteroid injection may be needed.

6. Knee Overuse Injuries

Overuse injuries develop gradually from repetitive stress on the knee without sufficient rest.

  • Examples: Tendinitis, bursitis, and stress fractures.
  • Symptoms: Pain, swelling, and inflammation, often worsening with continued activity.
  • Management: Rest, proper training techniques, and gradually increasing activity levels can help avoid these injuries.

Causes of knee pain due arthritis-related joint inflammation:

7. Rheumatoid Arthritis (RA)

Rheumatoid arthritis is an autoimmune condition where the immune system mistakenly attacks the joints, causing inflammation and damage. It is less common than osteoarthritis.

  • Unique Factors: Unlike osteoarthritis, RA can occur at any age and typically affects multiple joints symmetrically, including the knees.
  • Symptoms: Pain, swelling, redness, warmth, and joint deformity in advanced stages.
  • Management: Early diagnosis is key. Treatments include anti-inflammatory medications, immunosuppressants, physical therapy, and lifestyle modifications.

8. Gout

Gout is caused by the buildup of uric acid crystals in the joints, leading to sudden and intense pain.

  • Triggers: A high-purine diet, alcohol, dehydration, or certain medications.
  • Symptoms: Sharp pain, swelling, redness, and warmth, typically during a gout flare-up.
  • Management: Medications to lower uric acid levels, dietary changes, and proper hydration are crucial.

9. Pseudogout

Similar to gout, pseudogout involves the buildup of calcium pyrophosphate crystals in the joint.

  • Symptoms: Severe knee pain, swelling, and redness, often mistaken for gout.
  • Management: Anti-inflammatory medications and joint aspiration can help relieve symptoms.

Causes of knee pain due to trauma or acute injuries which usually need surgical intervention:

10. Meniscus Tears

The meniscus is a C-shaped cartilage that acts as a cushion and stabilizer for the knee joint. Tears in the meniscus are among the most common knee injuries.

  • How It Happens: A sudden twist, pivot, or heavy impact during sports or physical activities.
  • Long-Term Impact: If left untreated, meniscus tears can lead to chronic knee problems and increase the risk of osteoarthritis.
  • Symptoms: Pain, swelling, stiffness, and difficulty straightening or bending the knee.
  • Management: Treatment may range from rest and physical therapy to surgical repair in severe cases.

11. Ligament Injuries (LCL, PCL, MCL, ACL)

Ligaments are strong bands of tissue that connect bones and stabilize the knee joint. Injuries to these ligaments are common, particularly during sports or high-impact activities.

  • LCL (Lateral Collateral Ligament): Often injured by a force pushing the knee outward, typically during activities that involve twisting or sudden directional changes.
  • PCL (Posterior Cruciate Ligament): Injured from direct blows to the knee, often in car accidents.
  • MCL (Medial Collateral Ligament): Damaged during impact or a force pushing the knee inward.
  • ACL (Anterior Cruciate Ligament): Often torn during sudden stops, pivots, or changes in direction, as seen in sports like basketball or football.

 

  • Symptoms: Severe pain, instability, swelling, and difficulty bearing weight.
  • Management: Treatment may include bracing, physical therapy, or surgical reconstruction, depending on severity.

12. Fractures

Fractures involve breaks in the bones that make up the knee joint, including the femur, tibia, or patella.

  • Causes: Often the result of trauma such as falls, car accidents, or sports injuries.
  • Symptoms: Intense pain, swelling, bruising, and difficulty moving the limb.
  • Management: Immediate medical attention is required. Treatment typically involves immobilization, physical therapy, or surgery to ensure proper healing.

Takeaway: Caring for Your Knees

Knee pain can significantly impact your quality of life, but understanding its causes and taking proactive steps can help you maintain healthy, pain-free knees.

Whether it’s improving bone health, managing chronic conditions, or addressing acute injuries, early intervention is key!

Your knees are essential for mobility—taking care of them today ensures they’ll support you for years to come.

If you’re experiencing persistent knee pain, do consult a bone and joint specialist for thorough evaluation and personalized treatment.

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About Doctor

Dr Suresh Kumar J Hariharan

Consultant Orthopaedic Surgeon
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