Patellofemoral Pain Syndrome

The knee joint is made up of three main bones: the femur (thighbone), tibia (shinbone), and patella (kneecap). The patella sits in front of the knee joint and glides up and down within a groove on the femur called the trochlear groove as the knee bends and straightens.

The undersurface of the kneecap is covered with smooth articular cartilage, which helps it glide effortlessly during motion. The quadriceps muscles in the front of the thigh attach to the patella through the quadriceps tendon, and the patellar tendon connects the kneecap to the shinbone. Together, these structures allow powerful extension of the knee, essential for running, jumping, squatting, lunging, and climbing.

In a healthy knee, the patella tracks centrally in the groove. However, when the forces acting on the kneecap become imbalanced—such as from weak hip or thigh muscles, tight tissues, or altered limb alignment—it can shift slightly out of position. This creates excess pressure on certain areas of the cartilage and surrounding tissues, leading to inflammation and pain.

PFPS is one of the most frequent causes of knee pain, particularly in young adults and athletes. Studies estimate it accounts for 20–25% of all knee pain visits in sports medicine and orthopedic clinics.

It affects both men and women, though it is especially common in female athletes, possibly due to differences in hip and knee alignment. PFPS is also seen in individuals who suddenly increase their activity level—such as ramping up running mileage or starting a new exercise routine—without allowing time for the body to adapt.

While the condition is not usually associated with permanent damage, untreated PFPS can lead to persistent discomfort and may contribute to cartilage wear over time.

Diagnosis begins with a detailed history and physical examination. Dr. José Vega, Cleveland’s trusted knee specialist, will review your symptoms, activity level, and any prior knee injuries. During the exam, he will assess how your kneecap moves, test quadriceps and hip strength, and look for signs of malalignment or muscle imbalance.

Imaging may be used to rule out other causes of anterior knee pain:

• X-rays can show the position of the patella and help detect arthritis or bony abnormalities.
• MRI may be used in select cases to evaluate the cartilage, tendons, or bone under the kneecap.

PFPS is primarily a clinical diagnosis, meaning it’s based on symptoms and exam findings rather than imaging alone.

Treatment focuses on reducing pain, correcting muscle imbalances, and improving kneecap tracking. Most patients improve significantly with non-surgical management.

Conservative treatments include:

• Activity modification: Avoiding activities that worsen pain, such as deep squats or running on hills, until symptoms improve.
• Physical therapy: A structured program is the foundation of treatment. Therapy focuses on strengthening the quadriceps (especially the vastus medialis oblique), gluteal, and hip muscles to improve alignment and control of the patella. Stretching tight muscles—like the hamstrings, IT band, and quadriceps—can also reduce abnormal tracking forces.
• Taping or bracing: Patellar tracking braces or taping techniques can help guide the kneecap and relieve pressure.
• Ice and anti-inflammatory medications: These help decrease pain and swelling after activity.
• Footwear and orthotics: Custom or supportive shoe inserts may correct subtle alignment problems that contribute to pain.

In rare cases, when symptoms persist despite months of comprehensive therapy, arthroscopic or open surgery may be considered to correct alignment or remove damaged tissue. However, most patients improve without surgical intervention.

Prevention centers on maintaining strong, balanced, and flexible muscles around the hips, thighs, and knees. Simple lifestyle adjustments can greatly reduce the risk:

• Warm up and stretch before exercise and cool down afterward.
• Strengthen the hips and thighs, particularly the quadriceps and gluteal muscles, to improve knee alignment.
• Gradually increase training intensity rather than making sudden changes in distance, speed, or surface.
• Wear supportive footwear appropriate for your activity and foot type.
• Maintain a healthy weight, as excess weight increases stress on the knees.

Listening to early warning signs—such as pain during or after activity—can prevent small irritations from becoming chronic.