Is physical therapy important after knee microfracture surgery? My doctor told me I could just rehab it my self.

Yes. Therapy will enhance a good outcome.
Appropriate physical. Physical therapy directed at restoring a full range-of-motion is appropriate in the first 6 to 12 weeks following micro-fracture surgery particularly if there is a fixed flexion contracture or limited flexion prior to surgery. Motion without load is the preferred environment for articular cartilage healing.
very impt. After mf surgery I have my patients work w? Aphysical therapist to regains motion while stengthening their quadriceps.Also non weight bearing for 4-6 weeks if the mf is on the weight-bearing condyle is impt. Good luck!