Overview
Chondromalacia patella is irritation and softening or damage of the cartilage on the underside of the kneecap (patella), usually where it glides over the thigh bone (femur). When this cartilage surface is uneven or overloaded, movement of the knee can create pain, grinding sensations, and stiffness, especially with bending or kneeling. It does not always mean the cartilage has completely worn through, but it often reflects ongoing stress in the kneecap tracking system. Symptoms can improve when load is reduced and the muscles that stabilize the kneecap are strengthened.
Symptoms
People commonly feel pain in the front of the knee or around the kneecap, often made worse by stairs, squatting, kneeling, getting up from a chair, or prolonged sitting. Some patients notice creaking or grinding (crepitus) with knee motion and may have swelling after activity. The knee may feel weak or "unstable," not because of nerve injury, but because pain limits strength and control. In some cases, symptoms flare with running, jumping, or sudden changes in activity.
Causes
Chondromalacia patella typically develops when the kneecap experiences repeated mechanical overload or maltracking, causing cartilage stress and irritation. Common triggers include increased activity, poor movement mechanics, muscle imbalance (especially weaker hip muscles or fatigued quadriceps), and stiffness that changes how the kneecap tracks. Prior knee injury or misalignment can also contribute by altering the forces through the patellofemoral joint. Over time, normal cartilage wear plus repeated stress can lead to chronic symptoms.
Risk Factors
Risk is higher in people with kneecap tracking issues, weaker hip and thigh muscles, or tight structures around the knee that change patellar motion. Sudden increases in running, jumping, or stair-heavy work can overload the patellofemoral joint, especially if training is not gradual. Higher body weight can increase knee joint load during bending activities. Less commonly, prior patella or knee injury, congenital alignment differences, or foot/ankle mechanics that affect leg rotation can play a role.
Prevention
You can reduce flare-ups by gradually increasing activity and avoiding sudden spikes in squatting, stairs, or high-impact training. Focus on strengthening the quadriceps and hip muscles, improving flexibility, and practicing movement patterns that reduce kneecap stress. Maintaining a healthy weight can lessen the load that passes through the knee during daily activities. Supportive measures like proper footwear, biomechanical corrections when needed, and early attention to pain during workouts can help prevent symptoms from becoming chronic.
How the Diagnosis Is Evaluated
Clinicians usually start with a history of where the pain is felt, what activities trigger it, and whether there was a prior injury. A physical exam often includes checking kneecap tracking, range of motion, tenderness around the patella, strength of the quadriceps and hips, and tests that reproduce patellofemoral pain. X-rays can help rule out arthritis, fractures, or alignment issues, while MRI is sometimes used if symptoms persist or if there is concern for other cartilage or internal knee problems. Not every patient needs advanced imaging if symptoms respond to conservative care.
Nonsurgical Treatment Options
The first-line approach is to reduce painful loading while addressing the mechanics that stress the patellofemoral cartilage, typically through a structured physical therapy program. Treatment often includes strengthening (quadriceps and hip abductors/external rotators), improving flexibility (such as hamstrings and hip flexors), and using taping or bracing to improve patellar tracking for symptom control. Anti-inflammatory or pain-relief options such as NSAIDs, acetaminophen, and topical anti-inflammatories can help during flares, along with ice after activity when appropriate. Some patients benefit from orthotics or footwear adjustments if foot/ankle alignment is contributing to abnormal knee motion. For selected cases with persistent pain despite rehabilitation, clinicians may consider corticosteroid injections for short-term relief or biologic options such as platelet rich plasma (PRP); hyaluronic acid injections (for example Orthovisc) may also be considered, and stem-cell or adipose allograft injections are sometimes used in select situations though evidence varies.
When to Seek Medical Attention
Seek medical attention if pain is persistent, worsening, or limiting daily function despite a period of activity modification and basic conservative care. Prompt evaluation is needed if there is sudden inability to bear weight, a major new injury, large or rapidly increasing swelling, fever, or redness with warmth in the joint. Get urgent care if you develop severe weakness, sudden locking with inability to straighten the knee, or any concerning neurologic symptoms such as progressive numbness or loss of coordination.
Frequently Asked Questions
Many people improve substantially with physical therapy, activity changes, and correcting kneecap stress patterns, though symptoms can return if overload persists.
Strengthening the quadriceps and hip muscles, improving flexibility, and practicing controlled knee-bending mechanics usually provide the biggest benefit for patellofemoral pain.
Next Steps
If your symptoms are persistent or regularly flare with stairs, squatting, or prolonged sitting, consider an evaluation by a clinician or physical therapist to assess kneecap tracking and build a targeted rehab plan. In the meantime, reduce the specific activities that trigger pain and begin gentle, pain-limited strengthening and mobility work. If you have significant swelling, major injury, or inability to bear weight, seek prompt medical care.