Should I do microdermabrasion for scar removal?

Improvement of this scar can be done with a combination of chemical peels and laser.  Surgical excision is not warranted and topical creams may further help improve the scar. 

Microdermabrasion often gets confused with dermabrasion, a deeper treatment. Dermabrasion should only be performed by experienced dermatologic or plastic surgeons. That said, it is not a good choice to try to improve an old, longstanding scar on the lower leg, since lower legs heal poorly and need more delicate, subtle treatments.

Different types of lasers combined with the appropriate creams AND good sun protection (not just your average SPF 30 moisturizer) can be put together to improve an old lower leg scar that has become brown over time. See a board-certified dermatologist or plastic surgeon to begin to explore the more complex options.

Microdermabrasion is not the answer. However you might try Fraxel resurfacing to this scar. Treatment results have been excellent even in older scars.It will take multiple treaments and sun avoidance to this area is a necessity.

Unfortunately, microdermabrasion does not help scarring. It is too light of a treatment, and really only helps the skin feel smoother by removing the top layer of dead skin. Dermabrasion, which goes much deeper, can help scarring. However, I don't believe dermabrasion would help your scar since it is already flat.
There aren't many options for improving the scar pictured. This may be the best it ever gets. However, I do believe fractional non-ablative laser (Fraxel) could improve it. You would need several sessions to achieve this, and of course the scar won't go away completely. It may improve some though.

Thanks for your photo. No, Microdermabrasion will not help. Your scar is too old and matured to gain any improvement from minor intervention. I recommend a surgical scar revision.
Good Luck from MIAMI