WHAT’S THE LATEST ON RUNNER’S KNEE?
(Part 1)
“Runner’s knee” is a common term, most often referring to Patellofemoral Pain Syndrome (PFPS), but it can sometimes include other issues like IT Band Syndrome. The understanding and management of this condition have evolved significantly.
Here’s the latest on runner’s knee, from causes to cutting-edge treatment approaches.
The Shifting Understanding of Causes (It’s Rarely Just the Knee)
The old model of “your kneecap is out of track” is considered overly simplistic. The latest research points to a multifactorial cause, meaning several factors combine to create pain.
1. The Biopsychosocial Model is Front and Center:
· Biological: This includes the traditional biomechanical factors.
· Psychological: Stress, anxiety, and fear of pain (kinesiophobia) are now recognized as major contributors. If you’re stressed about your knee, you may change your gait in a way that actually increases load on the joint.
· Social: Factors like social support (or lack thereof) and work pressures can influence recovery.
2. “Load Management” is the Key Concept:
The primary cause is often a sudden change in the load on the knee joint without sufficient capacity to handle it. This is captured by the simple equation:
Load > Capacity = Pain
· Increased Load: Suddenly running farther, faster, or more frequently; adding too much hill work; returning to running after a break.
· Decreased Capacity: Weakness in key muscles, poor recovery (sleep, nutrition), or existing fatigue.
3. The Hip is Still Crucial, But Not the Only Player:
Weakness in the hip abductors and external rotators (glute medius) remains a primary culprit. When these are weak, the thigh bone rotates inward, pulling the kneecap laterally and increasing stress on the joint. However, the focus has expanded to the entire kinetic chain.
4. The Foot and Ankle’s Role is Context-Dependent:
The idea that everyone with runner’s knee needs motion-control shoes or orthotics is outdated. The effect of foot mechanics is highly individual. For some, excessive pronation can contribute; for others, it’s not a factor.
5. The Brain and Pain Processing:
Chronic runner’s knee can lead to changes in how the brain processes pain from the knee. The nervous system can become “sensitized,” meaning it perceives a non-threatening movement as painful. This is why treating just the tissue isn’t always enough.(To be continued)