I started walking 3 weeks after microfracture knee surgery. i was suppose to wait 5 weeks before weight bearing but i didn't. is that bad?

Depends: If you prefer a knee replacement, or chronic pain, both things am sure your orthopedist mentioned to you...Then, no problem. Guessing that might not be the case, get back on your crutches and off of it so it can continue to heal. The timelines set for post-op are based on time it takes to heal properly. Don't sabotage yourself by being in a rush. If feeling great, call and ask your ortho dr if ok.

yes can be bad: You need to fully wait the complete healing time prescribed by your surgeon no exceptions at all especially for your condition. You can always call for an earlier appt for reassurance all is healing well.

Possibly: The literature supports non weight bearing for 6 weeks after a microfracture. Earlier wt bearing certainly could compromise the quality of the cartilage regrowth, but this cannot be specifically defined. The larger the lesion or the patient, the more likely you will have a less than expected result.