This one shows up after the run is done. The climb felt manageable. The descent didn’t. By the time she’s sitting on the sea wall, both hands are on her knees — the pain sitting deep behind the kneecap, sharper on stairs, louder after sitting still.

They’ll blame the cartilage. They’ll point to wear and tear, order a scan, and suggest avoiding hills. But this isn’t a story about damage first. It’s a story about mechanics under load.

In this episode of The Foot Detective, we open the file on Patellofemoral Pain Syndrome — where the kneecap starts to grind not because it’s broken, but because it’s being pulled off course. We follow the clues through weak quad control, hip instability, training spikes, and foot pronation — each one shifting how force travels through the joint.

This is not ju ...