What Is Knee Tendonitis?

Tendonitis (also spelled tendinitis) is inflammation or irritation of a tendon; the thick band of tissue that connects muscle to bone.

In the knee, tendonitis most commonly affects:

• Patellar tendon (Jumper’s Knee)
• Quadriceps tendon
• Hamstring tendons
• Iliotibial (IT) band
• Pes anserine (Goosefoot) tendons

Repetitive overuse of the patellar tendon is often referred to as patellar tendinopathy; a broader term describing tendon degeneration from repetitive stress.

When tendons are repeatedly stressed without adequate recovery, small, microscopic tears can develop. Over time, these microtears may lead to persistent pain and tendon degeneration.

Common Types of Knee Overuse Injuries

Patellar Tendonitis (Jumper’s Knee)

Patellar tendonitis, also called patellar tendinopathy, involves inflammation of the tendon connecting the kneecap (patella) to the shinbone (tibia).

It is common in:

• Basketball and volleyball players
• Runners
• Athletes who frequently jump or sprint

Symptoms typically include:

• A dull ache at the front of the knee
• Pain just below the kneecap
• Increased pain with jumping, running or stair climbing
• Stiffness after activity

Patellar tendonitis is caused by repetitive stress and microscopic tearing of the tendon. If left untreated, inflammation may weaken the tendon and increase the risk of partial or complete rupture.

Initial treatment usually includes rest, ice, activity modification and structured physical therapy. Surgical intervention is rarely required unless there is significant tendon damage or rupture.

Quadriceps Tendonitis

This condition affects the tendon connecting the quadriceps muscle to the top of the kneecap.

Common symptoms include:

• Pain above the kneecap
• Discomfort when straightening the knee
• Swelling and tenderness

Quadriceps tendonitis often develops in athletes who perform explosive or repetitive movements.

Iliotibial Band Syndrome (IT Band Syndrome)

The iliotibial band runs from the hip to the outside of the knee. Repetitive bending and straightening of the knee can create friction along the outer knee.

Common in runners and cyclists, symptoms include:

• Lateral (outer) knee pain
• Pain that worsens with downhill running
• Tenderness along the outside of the knee

Pain after repetitive activity is a key indicator of IT band irritation.

Pes Anserine (Goosefoot) Tendonitis or Bursitis

This condition affects the tendons and bursa on the inner side of the knee, just below the joint line.

It is often seen in:

• Runners
• Individuals with knee arthritis
• Patients with altered walking mechanics

Symptoms include medial knee pain and tenderness when climbing stairs. Persistent swelling or worsening pain should be evaluated by a specialist.

What Causes Knee Overuse Injuries?

Overuse injuries occur when repetitive stress exceeds the body’s ability to recover.

Common contributing factors include:

• Sudden increases in activity intensity, duration or volume
• Poor biomechanics or improper form
• Weak hip or core muscles
• Tight hamstrings or calf muscles
• Inadequate warm-up
• Improper footwear
• Muscle imbalance

Overuse knee injuries result from repetitive loading of joint tissues without sufficient rest between activities. Because the knee is a weight-bearing joint, it absorbs significant force during walking, running and jumping, sometimes several times body weight.

Symptoms of Knee Tendonitis and Overuse Injuries

Symptoms typically develop gradually and may include:

• Dull, aching knee pain
• Pain that worsens with activity
• Tenderness along a tendon
• Mild swelling
• Stiffness after rest
• Pain when climbing stairs or squatting

Unlike acute ligament injuries, overuse conditions rarely cause sudden instability or rapid swelling.

How Knee Tendonitis Is Diagnosed

Accurate diagnosis is essential to rule out other causes of knee pain such as meniscus tears, ligament injuries or arthritis.

At OrthoTexas, evaluation includes:

Comprehensive Clinical Examination

• Detailed medical and activity history
• Assessment of pain location
• Strength and flexibility testing
• Gait and movement analysis

Imaging (When Needed)

• X-rays to rule out bone-related conditions
• MRI to evaluate tendon damage or inflammation
• Ultrasound for dynamic tendon assessment

Many cases can be diagnosed clinically without advanced imaging.

Non-Surgical Treatment for Knee Tendonitis

Most tendonitis and overuse injuries improve with conservative care. OrthoTexas prioritizes non-surgical treatment whenever possible.

Rest and Activity Modification

Reducing high-impact activities allows the tendon to heal.

Ice and Inflammation Control

Applying ice after activity helps reduce irritation.

Physical Therapy

A structured rehabilitation program focuses on:

• Eccentric strengthening exercises
• Quadriceps and hip strengthening
• Core stabilization
• Flexibility training
• Movement retraining

Physical therapy is the cornerstone of treatment and helps prevent recurrence.

Bracing or Support

Patellar straps or supportive braces may reduce tendon strain during activity.

Medications

Nonsteroidal anti-inflammatory drugs (NSAIDs) may help manage short-term pain.

Advanced Non-Surgical Treatments

In select cases:

• Image-guided corticosteroid injections
• Regenerative medicine therapies
• Targeted sports rehabilitation programs

When Is Surgery Needed?

Surgery is rarely required for tendonitis. It may be considered if:

• There is a complete tendon rupture
• Symptoms persist despite months of conservative treatment
• Significant tendon degeneration is present

Procedures may involve the removal of damaged tissue (debridement) or tendon repair.

Recovery Timeline

Recovery depends on severity and adherence to rehabilitation.

• Mild cases: 2-6 weeks
• Moderate cases: 6-12 weeks
• Severe cases: Several months

Returning to sport too soon increases the risk of re-injury. A structured, gradual return-to-activity plan is essential.

Preventing Knee Overuse Injuries

You can reduce your risk by:

• Gradually increasing activity intensity
• Cross-training with low-impact exercise
• Strengthening hip, core and thigh muscles
• Stretching tight muscle groups
• Wearing proper footwear
• Allowing adequate recovery time

Early evaluation of persistent knee pain can prevent long-term tendon damage.

When to See a Knee Specialist

Schedule an appointment at OrthoTexas if you experience:

• Knee pain lasting more than 1-2 weeks
• Pain that worsens with activity
• Swelling or tenderness along a tendon
• Difficulty climbing stairs
• Pain that interferes with sports or daily activities

Prompt evaluation allows for early treatment and improved outcomes.

Comprehensive Knee Care at OrthoTexas

OrthoTexas provides advanced care for knee tendonitis and overuse injuries, including:

• Advanced diagnostic imaging
• Conservative rehabilitation programs
• Injection therapy when appropriate
• Sports medicine expertise
• Surgical consultation when necessary

Our fellowship-trained orthopedic specialists are committed to relieving knee pain, restoring mobility and helping you return to an active lifestyle safely.