Although less common than patellar tendonitis, quadriceps tendonitis is an important cause of quad pain above the kneecap. So how do we diagnose quadriceps tendon pain, and what can we do about it?

Quadriceps tendonitis is one of several causes of front-of-knee pain. It differs from a quadriceps tendon tear (rupture of the tendon) and a quadriceps muscle tear (a strain of the muscle belly).

What is the quadriceps tendon?

knee joint

The quadriceps tendon attaches the large quadriceps muscle to the top of the kneecap (patella). This large tendon transfers force from the thigh to the lower leg, much like the patellar tendon below the kneecap.

Causes of quadriceps tendonitis

Like the Achilles and patellar tendons, the quadriceps tendon swells and its collagen breaks down under excessive load. We usually see quadriceps tendon pain in jumping sports such as CrossFit, rugby, and volleyball. There’s often a history of a sudden increase in training frequency or intensity, which triggers the swelling and breakdown. We also see it in older, active people with calcification of the quadriceps tendon, which itself causes pain and irritation.

In some cases, the swelling is driven by a suprapatellar plica. This plica blocks the flow of knee fluid, raising pressure in the upper part of the knee and swelling the quadriceps tendon. In an observational study co-authored by Dr Masci, seven active athletes with intractable quadriceps tendonitis underwent arthroscopic surgery — all seven had a large suprapatellar plica separating the suprapatellar pouch from the rest of the joint. We suspect this increases joint pressure, altering the forces on the quadriceps tendon and increasing the risk of tendonitis.

Diagnosis of quad tendonitis

Common symptoms of quadriceps tendon pain include quad pain above the kneecap that’s worse during and after activity, tenderness to the touch along the tendon, and usually no locking or giving way of the knee.

Your doctor examines the knee to rule out other causes of pain above the kneecap, such as kneecap arthritis, fat pad impingement, torn meniscus, pes bursitis, housemaid’s knee, and patellar tendonitis.

We often use imaging to confirm quad tendonitis and exclude other causes. Ultrasound and MRI both detect tendon swelling and collagen breakdown. Ultrasound has advantages — it shows calcification more clearly, in real time, and at a lower cost.

Treatment of quadriceps tendonitis

We use simple treatments first: activity modification (reducing jumping), soft-tissue massage to the thigh, anti-inflammatory tablets such as ibuprofen, and strengthening exercises.

Quadriceps tendonitis exercises

patellar tendonitis

Strengthening exercises that target the quadriceps help relieve pain above the kneecap. A physiotherapist should supervise these. They include weighted squats, lunges, hack squats, leg press, and leg extensions — and we generally favour single-leg over double-leg exercises.

If simple treatments fail, we add other therapies — GTN patches, shockwave therapy, or tendon injections. Shockwave and needle tenotomy are particularly effective when the tendon has calcified.

Surgery is reserved for cases that fail all other treatments. Open surgery to remove a degenerative tendon is often unsuccessful. Still, knee arthroscopy to remove a suprapatellar plica can help — the study above found removing the plica significantly improved symptoms and allowed a full return to sport. We recommend considering arthroscopy for intractable quadriceps tendonitis that hasn’t responded to other treatments.

More on injections for quadriceps tendonitis

Injections are invasive and carry some risk and unpredictability, so they should be considered only after non-invasive treatments such as exercise and shockwave.

Cortisone injections can be harmful to the tendon and are best avoided. Needle tenotomy stimulates inflammation to encourage healing. Some doctors use PRP, though the evidence for it in quad pain above the kneecap is limited. For tendon calcification, we generally recommend a needle tenotomy to break down the calcium, sometimes followed by a small dose of cortisone to help dissolve it. We use ultrasound to ensure the injection hits the right spot.

How do we manage quadriceps tendon tears?

A quadriceps tendon tear usually follows acute trauma such as a fall or explosive movement, different from the gradual overload of tendonitis. A complete tear needs surgical repair, while partial tears are treated with rehab, supplemented by PRP if needed. See the dedicated quadriceps tendon tear page for details.

Frequently asked questions about quadriceps tendinopathy

What does quadriceps tendonitis feel like?

Pain just above the kneecap that’s worse during and after activity — especially jumping, squatting, or stairs — and tender to the touch over the tendon. Unlike a meniscal or kneecap problem, there’s usually no locking or giving way.

How is quad tendonitis different from patellar tendonitis?

Both are jumping-athlete tendon problems, but the pain sits in different places. Quadriceps tendonitis is above the kneecap; patellar tendonitis (jumper’s knee) is below it. The rehab principles are similar.

How long does quadriceps tendonitis take to heal?

Like most tendon problems, it’s slow — often 3–6 months with a consistent strengthening programme. Rushing back tends to prolong it.

Should I keep exercising with quadriceps tendonitis?

Usually, yes, with modification. Heavy, slow resistance work is generally well tolerated, even with some discomfort, but reduce jumping and explosive loading that aggravate it. A physiotherapist can guide the load.

When should I worry it might be a tear rather than tendonitis?

If the pain came on suddenly during an explosive movement or fall, you felt a pop, or you can’t straighten the knee or do a straight-leg raise, that suggests a quadriceps tendon tear rather than tendonitis — and needs prompt assessment.

Final word from Sport Doctor London about quadriceps tendonitis

Quadriceps tendonitis is a less common cause of pain at the front of the knee, with focal quad pain above the kneecap. Treatment follows the general principles of tendon care — GTN patches or shockwave, then injections in complex cases, with surgery only as a last resort.

To book a one-stop knee assessment with Dr Masci in London, contact the team here or call +44 (0) 203 488 0350.

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