BPC-157 for knee rehab: does the hype hold up to scrutiny?

What did @chudifit actually say?

After tearing a knee tendon, @chudifit says doctors told him to stay away from squatting. He ignored that advice and used four exercises, eccentric decline squats, wusses (isometric holds), step downs, and Spanish squats, to rebuild his knee and eventually squat again. His core claim is that "the slower you go, the more room for tendon growth." He also frames this as "proving them wrong."

To be fair, he names specific exercises with real mechanical rationale. He's not selling a supplement here or claiming a miracle. He's describing a rehabilitation progression that, on its surface, overlaps with actual physical therapy protocols. That matters. But the framing of defying medical advice as a badge of honor is worth examining carefully before anyone copies this approach.

Does the science back this up?

Partly, yes. The eccentric loading research is genuinely solid. The Spanish squat framing is reasonable but oversimplified.

Eccentric decline squats for patellar tendinopathy are among the best-studied interventions in sports medicine. Alfredson et al. (1998, American Journal of Sports Medicine) showed that heavy-load eccentric training produced significant pain reduction and return to sport in patients with chronic patellar tendon pain who had previously failed conservative treatment. The decline board specifically increases patellar tendon load while controlling quad activation, which is the point.

Isometric quad holds, similar to what he calls "wusses," have also earned legitimate attention. Rio et al. (2015, British Journal of Sports Medicine) found that isometric contractions reduced tendon pain acutely and may help maintain quad strength during early rehab when heavy loading is not yet appropriate.

Step-down exercises are standard in ACL and tendon rehab for single-leg stability. The Spanish squat, which uses a strap or fixed object to keep the tibia vertical, does shift load toward the quad and away from the proximal tendon, though the evidence base here is thinner than he implies.

What did they get wrong (or right)?

The biggest problem is the framing, not the exercises. "Proving them wrong" after a tendon tear is not a rehabilitation philosophy. It is a risk factor.

We do not know what tendon he tore, how severely, or whether he had imaging follow-up. Patellar tendon rehab and ACL reconstruction have completely different return-to-sport timelines and loading protocols. Recommending "four times a week" for any injured person watching a 60-second TikTok, without knowing their diagnosis, tissue healing stage, or pain response, is genuinely irresponsible regardless of whether the exercises themselves are legitimate.

His claim that eccentric decline squats helped him achieve "a four engine motion squat" appears to mean a full-depth squat. That is plausible. Eccentric work does build tendon stiffness and quad strength over time, and Beyer et al. (2015, American Journal of Sports Medicine) confirmed long-term structural tendon adaptation with heavy slow resistance training.

What he got right: the exercise selection is not random. Eccentric work, isometrics, and controlled step-downs are used by actual physios. He is not recommending peptides, injections, or anything outside standard movement rehab. Credit where it is due.

What should you actually know?

If you have a tendon injury, the exercise list here is not the problem. The protocol without clinical context is.

Tendon healing has distinct phases, inflammatory, proliferative, and remodeling, and loading too early or too aggressively in the wrong phase can cause re-rupture or chronic degeneration. Cook and Purdam (2009, British Journal of Sports Medicine) describe this in their tendon continuum model and explicitly warn that progressive loading must be matched to tissue state, not just symptom tolerance.

"Slow" eccentric loading does produce tendon collagen synthesis. That part of his cue is backed by evidence. But the appropriate load, tempo, and frequency depend on injury severity, which requires assessment by a licensed clinician, not a DM to a fitness creator.

If your doctor said no squatting, the right move is to ask why and what the return-to-loading criteria are, not to treat the restriction as an obstacle to overcome on social media.