Runner’s Knee (Patellofemoral Pain) Explained:

Common Conditions We Treat (and Why They Happen)

Runner’s knee—clinically known as patellofemoral pain syndrome (PFPS)—is one of the most prevalent knee complaints among active individuals, but it’s far from exclusive to runners. The patellofemoral joint is where the kneecap (patella) meets the thigh bone (femur). When the kneecap doesn’t track smoothly through its groove during movement, it creates friction, irritation, and eventually pain. Understanding why this happens is key to fixing it.

Poor Patellar Tracking

The kneecap is held in position by a delicate balance of muscle pulls from the quadriceps, the IT band, and surrounding soft tissue. When this balance is disrupted—often due to a tight IT band pulling the kneecap outward, or weak inner quad muscles failing to keep it centered—the patella rubs unevenly against the femur with every step. This causes the characteristic aching pain around or behind the kneecap, especially during squatting, climbing stairs, running, or sitting for extended periods.

Quad and Hip Weakness

Research consistently shows that weakness in the hip abductors and external rotators plays a major role in patellofemoral pain. When the hip can’t control femoral rotation, the thigh collapses inward during weight-bearing activities, shifting the kneecap off its optimal path. Strengthening the hips is often as important as addressing the knee directly.

Overuse and Training Load

Sudden spikes in training volume—more miles, more squats, more stairs—can overwhelm the patellofemoral joint before the surrounding muscles have adapted. This is especially common in newer athletes or those returning to exercise after a break. The joint becomes irritated faster than the body can recover.

Structural and Foot-Related Factors

Flat feet or excessive foot pronation can internally rotate the lower leg, altering how force is transmitted to the kneecap. Footwear, running surface, and even minor leg length discrepancies can all contribute to abnormal patellar loading over time.

The Bottom Line

Runner’s knee is almost always a mechanical problem—not a structural damage issue—which means it responds exceptionally well to conservative care. By addressing the soft tissue restrictions, muscle imbalances, and movement faults driving poor patellar tracking, most patients experience significant relief without injections or surgery. The key is identifying where the breakdown in the kinetic chain actually starts.