Why Knee Pain Is Often a Hip Problem, Not a Knee Problem.

Hip instability causes knee pain because the knee is forced to compensate for a weaker link upstream in the kinetic chain. According to Squat University's Dr. Aaron Horschig, this is exactly what happened to 3-time Olympian and world champion Mirabai Chanu after a severe injury.

Her hip was unstable, so the knee took the brunt of that failure every time she loaded her leg. Instead of treating the knee directly, Horschig focused his rehab on restoring hip stability — the actual source of the problem. This is the core lesson of the video: stop assuming knee pain means your knee is the problem, because the real issue is often elsewhere in the chain.

You test for posterior chain stabilization dysfunction with a single-leg glute bridge, comparing the healthy leg to the injured leg. On Mirabai Chanu's healthy side, Horschig found she only felt her glutes firing during the movement — normal, efficient activation.

On her injured side, however, her quads were also working alongside the glutes. That extra quad recruitment signaled her body was compensating for a hip that couldn't stabilize on its own, which is the hallmark of posterior chain stabilization dysfunction. This asymmetry between sides is what let Horschig pinpoint the hip, not the knee, as the true source of her pain.

Two exercises drove Mirabai Chanu's recovery: a banded single-leg glute bridge and a banded Cossack squat. Horschig used them in this order:

1. Perform a single-leg glute bridge with a resistance band added — Horschig notes this instantly enhanced glute activation.
2. Transition into a Cossack squat while maintaining the same band pull.
3. Use the band tension to teach the hip how to find stability specifically in the position where the pain used to peak.

Within weeks of this progression, according to Horschig, Chanu's pain vanished and her strength came back.

Mirabai Chanu returned to elite competition and won silver at the World Championships later that year, according to Horschig. Before the rehab, she was dealing with a severe injury that threatened her ability to compete at the highest level as a 3-time Olympian and world champion weightlifter.

The caption notes a full 2025 knee pain rehabilitation video covering this case is available on the SquatU YouTube channel, with anatomy graphics credited to Muscle and Motion. India's weightlifting community celebrated her return to the podium at a World Championship.