Knee Tendinitis - Causes, Treatment & When to See a Doctor

What is Knee Tendinitis?

Knee tendinitis, also known as tendinopathy, is a condition characterized by inflammation or irritation of the tendons around the knee joint. Tendons are thick cords that connect muscles to bones, and they play a critical role in movement. When overused or injured, tendons can become thickened, painful, and less flexible. Knee tendinitis is most commonly seen in athletes, runners, or individuals who engage in repetitive knee motions. According to the Mayo Clinic, this condition often affects the patellar tendon (located below the kneecap) or the tendons of the quadriceps muscle. It can lead to significant discomfort and limit mobility if left untreated.

Common Causes

Knee tendinitis typically results from overuse or repetitive stress on the knee tendons. Below are eight to ten common causes:

• Overuse or Repetitive Strain: Activities like running, jumping, or cycling that stress the tendons repeatedly can cause micro-tears and inflammation.
• Sudden Increase in Activity: Ramping up the intensity or duration of physical activity too quickly may overload the tendons.
• Improper Footwear: Worn-out or unsupportive shoes can place excessive pressure on knee tendons.
• Muscle Imbalances: Weak or tight muscles, especially in the quadriceps or hamstrings, can put uneven stress on the tendons.
• Direct Injury: A blow to the knee or a fall can damage the tendons or cause tendinitis.
• Obesity: Excess weight increases stress on the knee joints and tendons.
• Systemic Conditions: Diseases like rheumatoid arthritis or gout can contribute to tendon inflammation.
• Poor Technique: Improper form during exercise or sports can strain the tendons.
• Patellar Tendinitis (Jumper’s Knee): A specific type of knee tendinitis common in basketball or volleyball players.
• Osgood-Schlatter Disease: A condition in adolescents where repetitive stress affects the patellar tendon near the shinbone.

*Sources: Mayo Clinic, CDC, and sports medicine research*

Associated Symptoms

Knee tendinitis often causes localized pain and functional limitations. Common symptoms include:

• Pain: Aching or stabbing pain around the knee, especially during or after activity.
• Swelling: Mild swelling or puffiness near the affected tendon.
• Tenderness: Sharp pain when the area is touched or pressed.
• Stiffness: Difficulty moving the knee, especially after rest or in the morning.
• Popping Sensation: A clicking or grinding feeling when bending or straightening the knee.
• Weakness: Reduced strength in the affected leg, making it hard to climb stairs or jump.

These symptoms may worsen with activities that stress the tendons, such as running, squatting, or climbing stairs. According to the Cleveland Clinic, symptoms typically improve with rest but may persist without proper treatment.

When to See a Doctor

Most cases of knee tendinitis resolve with home care, but seek medical attention if:

• Pain is severe or persistent: If pain lasts more than a few weeks despite rest and ice.
• Swelling increases: Significant or sudden swelling that limits movement.
• Inability to bear weight: If you cannot walk or put pressure on the knee.
• Redness or warmth: Signs of possible infection, which may indicate a different condition.
• Fever: A fever accompanying knee pain could signal a systemic issue.

Early diagnosis is crucial to prevent long-term tendon damage. The NIH recommends consulting a healthcare provider if symptoms interfere with daily activities.

Diagnosis

Diagnosing knee tendinitis involves a combination of physical examination and diagnostic tests:

• Medical History: The doctor will ask about your activity level, symptoms, and any recent injuries.
• Physical Exam: The provider will check for swelling, tenderness, and range of motion.
• Imaging Tests: X-rays, MRI, or ultrasound may be used to rule out other conditions and assess tendon health.
• Tendon Strain Tests: Specific movements may be performed to identify pain or swelling in the tendons.

According to the American Academy of Orthopaedic Surgeons, MRI is often the gold standard for diagnosing tendinitis, as it shows soft tissue damage not visible on X-rays.

Treatment Options

Treatment aims to reduce pain, inflammation, and restore tendon function:

Medical Treatments

• Rest and Ice: Avoid activities that worsen symptoms and apply ice packs (15-20 minutes) to reduce swelling. (Mayo Clinic)
• Physical Therapy: Exercises to strengthen supporting muscles and improve flexibility.
• NSAIDs: Over-the-counter medications like ibuprofen can alleviate pain and inflammation.
• Corticosteroid Injections: Sometimes used to reduce inflammation, though not always recommended for first-line treatment due to potential side effects.

Home Remedies and Self-Care

• Compression Garments: Elastic bandages can support the knee and reduce swelling.
• Stretching: Gentle stretches for the quadriceps and hamstrings can improve tendon flexibility.
• Low-Impact Exercise: Swimming or cycling may maintain fitness without stressing the knee.

In severe cases, surgery may be required to repair or reconstruct damaged tendons. Always follow your doctor’s advice to avoid exacerbating the condition.

Prevention Tips

Preventing knee tendinitis involves proactive measures to reduce tendon stress:

• Warm Up and Cool Down: Spend 5-10 minutes warming up before activity and cooling down afterward.
• Strengthen Leg Muscles: Focus on exercises that target the quadriceps, hamstrings, and calf muscles.
• Use Proper Technique: Ensure correct form during sports or workouts to minimize tendon strain.
• Invest in Supportive Footwear: Choose shoes with adequate cushioning and arch support.
• Progress Gradually: Increase activity intensity or duration slowly to allow tendons to adapt.
• Maintain a Healthy Weight: Losing excess weight reduces stress on knee tendons.
• Include Stretching in Routine: Daily stretching can improve tendon elasticity and reduce injury risk. (CDC Prevention Recommendations)

Emergency Warning Signs

If you experience any of the following, seek immediate medical attention:

• Inability to move the knee due to severe pain or swelling.
• Sudden, intense pain that doesn’t improve with rest.
• Signs of infection, such as redness, warmth, or fever.
• Numbness or tingling around the knee, which could indicate nerve involvement.

These symptoms may signal a more serious condition, such as a torn tendon or septic arthritis, requiring urgent care.

Knee tendinitis is a manageable condition with the right approach. By following prevention and treatment strategies, most people can return to daily activities safely. If symptoms persist or worsen, consult a healthcare provider to ensure proper care and avoid complications.

For more information, consult resources like the Mayo Clinic, Cleveland Clinic, or the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS).