Patellar Tendonitis

The knee is a powerful joint that depends on a balance between bones, tendons, and muscles for stability and movement. The quadriceps muscles in the front of the thigh attach to the top of the kneecap through the quadriceps tendon. The patellar tendon then connects the bottom of the kneecap to the top of the shinbone. Together, they form a continuous chain that allows you to straighten your leg, jump, and absorb landing forces.

During activities that involve repeated jumping or running, the patellar tendon is placed under high stress as it transfers force from the quadriceps to the lower leg. If the load becomes too great—either from training errors, muscle tightness, or improper mechanics—the tendon can develop microtears that lead to inflammation and pain.

The pain is typically located just below the kneecap and may worsen during jumping, running, or climbing stairs. In early stages, symptoms might appear only after activity, but as the condition progresses, pain can occur even during daily movements like standing or walking.

Patellar tendinitis is particularly common among athletes who engage in sports requiring frequent jumping, quick direction changes, or explosive leg power. Studies estimate that up to 20% of jumping athletes—especially those in volleyball, basketball, and soccer—develop patellar tendinitis at some point in their careers.

However, the condition isn’t limited to competitive athletes. Recreational runners, weightlifters, and people who suddenly increase workout intensity or frequency can also develop it. Risk factors include:

• Tight quadriceps or hamstrings, which increase tension on the tendon.
• Weak gluteal or core muscles, leading to poor lower body alignment.
• Improper training surfaces or worn footwear.
• Sudden changes in activity, such as an abrupt return to exercise after inactivity.

Men tend to be affected slightly more often than women, likely due to differences in activity patterns and muscle loading.

Diagnosis is based on a detailed history, symptom pattern, and physical examination. Dr. José Vega, Cleveland’s trusted knee specialist, will ask about your activity level, training habits, and the type of pain you experience.

During the exam, tenderness is often felt just below the kneecap along the patellar tendon. Pain is typically reproduced when the knee is straightened against resistance or during a squat or jump.

Imaging studies may be used to confirm the diagnosis or rule out other causes of knee pain:

• Ultrasound can visualize tendon thickening or small tears.
• MRI can show the extent of tendon damage and detect chronic degeneration.

It’s important to distinguish acute tendinitis (inflammation) from chronic tendinopathy (degeneration without inflammation), as treatment approaches may differ.

Most cases of patellar tendinitis improve with conservative, non-surgical treatment focused on reducing tendon stress and promoting healing.

Initial treatment may include:

• Activity modification: Temporarily reducing or avoiding jumping and high-impact exercise.
• Ice therapy: Applying ice after activity helps reduce pain and inflammation.
• Anti-inflammatory medications: Short-term use of NSAIDs can ease symptoms.
• Physical therapy: A cornerstone of treatment. Exercises target flexibility, strength, and tendon load tolerance. Therapy often includes eccentric strengthening—controlled lengthening of the quadriceps muscle—which has been shown to promote tendon healing.
• Bracing or taping: A patellar strap can reduce strain on the tendon during movement.
• Biologic injections: Platelet-rich plasma (PRP) or other biologic therapies may be recommended for chronic cases to stimulate tissue repair.

If symptoms persist after months of non-operative management, minimally invasive surgical options such as arthroscopic debridement or tendon repair may be considered. These procedures remove diseased tissue and promote healthy tendon regeneration.

Rehabilitation following surgery or biologic treatment involves a gradual, structured strengthening program, often allowing return to full activity within several months.

Prevention focuses on maintaining flexibility, strength, and proper technique during physical activity. Helpful strategies include:

• Warm up properly: Gentle stretching and dynamic movements prepare the tendon for activity.
• Strengthen the lower body: Regularly train the quadriceps, gluteal, and hamstring muscles to balance knee forces.
• Increase training gradually: Avoid sudden changes in volume or intensity.
• Cross-train: Incorporate low-impact activities like swimming or cycling to reduce repetitive stress.
• Maintain good flexibility: Stretching the quadriceps and hamstrings reduces tension on the patellar tendon.
• Wear supportive shoes: Proper footwear helps absorb shock and maintain alignment.

Listening to your body and addressing early signs of knee pain can prevent mild tendon irritation from progressing to chronic injury.