Patellofemoral pain syndrome (PFPS), or runner’s knee, got its nickname for an obvious and very unfortunate reason—it’s common among runners. The stress of running can cause irritation where the kneecap (patella) rests on the thighbone. The resulting pain can be sharp and sudden or dull and chronic, and it may disappear while you’re running, only to return again afterward. While biomechanical issues may be to blame for runner’s knee, the cause can often be traced back to poorly conditioned quadriceps and tight hamstrings.
Weak quads aren’t able to support the patella, leading it to track out of alignment, and inflexible hamstrings can put pressure on the knee. If you want to treat and avoid another bout with runner’s knee, add strengthening and stretching to your routine.