Broken legs and ankles heal better if you walk on them within weeks

If anyone's heard of RICE (Rest, Ice, Compression, Elevation) for healing joints, the new guidance is called POLICE: Protect, Optimal Load, Ice, Compression, and Elevation. The key differences being Protect and Optimal Load, meaning don't re-injure it and expose it to some level of weight-bearing or usage.

Anyone can RICE their joints. It's foolproof, more or less objective and requires no monitoring from a professional.

What defines optimal load? It sounds impossible to gauge, unless maybe if you're working with a physical therapist. Then, what happens if load more than the optimal level? Is the outcome worse than if you just stuck to RICE? I think these are things that have to be considered for medical protocols.

Optimal load is right before it starts hurting. You progressively load, and when it starts hurting you unload. Your body will send pain before there is damage to be done.

Edit: in fact some discomfort or right kind of pain is good. Else you give to atrophy.

Your edit shows that there is no good rule for the threshold where pain would indicate too much load vs. still being in the beneficial range. We don’t even have a good way to assess subjective pain (one’s 3 is another one’s 7, etc.). “Optimal load” is really just a tautology.