Chondromalacia Patella (Runner’s Knee): Symptoms and Treatment

If the front of your knee aches after sitting a while or when you climb stairs, and you sometimes feel a grinding under the kneecap, chondromalacia patella — often called runner’s knee — may be the cause. It’s common, especially in active people, and the good news is that it usually improves with the right exercises and a few simple changes. Here’s what it is and how to settle it down.

What is chondromalacia patella?

Chondromalacia patella is the softening and breakdown of the smooth cartilage on the underside of the kneecap (patella). That cartilage normally lets the kneecap glide over the thighbone as you bend and straighten the knee. When it becomes irritated, the kneecap no longer moves as smoothly, which causes pain and sometimes a grinding sensation at the front of the knee. Because it’s common in runners and other active people, it’s frequently called “runner’s knee,” though it affects non-athletes too.

Symptoms of chondromalacia patella

• A dull ache at the front of the knee, around or behind the kneecap
• Pain that’s worse going up or down stairs, squatting, or kneeling
• The “movie-goer’s sign” — aching after sitting with the knee bent for a long time
• A grinding or clicking feeling when you bend or straighten the knee
• Occasional mild swelling

What causes chondromalacia patella?

It usually comes down to the kneecap not tracking smoothly in its groove, which overloads the cartilage. Contributing factors include muscle imbalance or weakness — especially in the thigh (quadriceps) and hip muscles — tight muscles, flat feet or alignment differences, a sudden increase in running or jumping, and previous knee injury. It’s more common in active people and in women, partly due to differences in hip and knee alignment.

How is chondromalacia patella diagnosed?

Diagnosis is usually clinical: your history and an exam that checks kneecap tracking, tenderness, and the muscles around the hip and knee. Your doctor may press on or move the kneecap to reproduce the pain. Imaging isn’t always needed, but an X-ray or MRI can be used to look at alignment and cartilage and to rule out other causes of knee pain such as arthritis or a meniscus problem.

How is chondromalacia patella treated?

The great majority of cases improve without surgery.

Activity changes and self-care

Easing off the activities that spark the pain — deep squats, stairs, long runs — while staying active in low-impact ways lets the cartilage settle. Ice after activity and an over-the-counter anti-inflammatory can help a flare.

Physical therapy

This is the cornerstone. A therapist targets the muscles that control kneecap tracking — strengthening the quadriceps and hips, stretching tight tissues, and correcting movement patterns. Taping, a brace, or supportive footwear or orthotics can help in some cases.

When more is needed

If pain persists despite good rehabilitation, further evaluation and, rarely, a procedure to address kneecap tracking or cartilage may be considered. Our overview of knee surgery options covers those situations, and the American Academy of Orthopaedic Surgeons’ patient site, OrthoInfo, is a good reference.

Exercises that help (and what to ease off)

Because weak or imbalanced muscles are so often behind it, strengthening is what produces lasting relief. Low-impact quad and hip strengthening — done without pain — along with gentle stretching of tight muscles, tends to help most. In the meantime, it’s wise to ease off deep squats, lunges, and high-impact activity until symptoms calm down. A physical therapist can tailor the right routine and make sure you’re not aggravating the kneecap.

When should you see a doctor?

See a specialist if front-of-knee pain lasts more than a few weeks, limits your activity, or keeps coming back. Getting the diagnosis and starting the right strengthening early usually prevents a nagging problem from lingering.

Frequently asked questions

What does chondromalacia patella feel like?

It usually feels like a dull ache at the front of the knee, around or behind the kneecap, that’s worse with stairs, squatting, or sitting with the knee bent for a while. Many people also notice a grinding or clicking sensation when they move the knee.

Is chondromalacia patella the same as runner’s knee?

The terms overlap. “Runner’s knee” is a common nickname for pain at the front of the knee, and chondromalacia patella — softening of the cartilage under the kneecap — is a frequent cause. Not everyone with runner’s knee has chondromalacia, so an exam helps pin down the cause.

Can chondromalacia patella heal on its own?

Milder cases often improve with activity changes and time, but the irritation tends to return if the underlying muscle imbalance isn’t addressed. Targeted strengthening of the quad and hip muscles is what usually produces lasting relief.

What exercises should I avoid with chondromalacia?

During a flare it’s best to ease off deep squats, lunges, and high-impact activity like running and jumping, which load the kneecap. Low-impact strengthening done without pain is encouraged — a physical therapist can tailor the safe moves for you.

Does chondromalacia lead to arthritis?

In some cases long-standing cartilage irritation can contribute to wear over time, which is one reason to treat it and correct the underlying causes. Many people, though, settle their symptoms with rehabilitation and keep the knee healthy.

This article is for general education and is not a substitute for medical advice. Talk with a qualified clinician about your specific symptoms.