Is TMJ a Contraindication for SMAS Facelift?

A facelift lifts and tightens the underlying SMAS plus lifts, tightens and removes excess skin. It should not affect the functioning of the jaw or any other bones or joints. It should have no affect whatsoever on your TMJ. I hope this helps.

TMJ and SMAS lift
The SMAS lift repositions the underlying fat and to some degree the fine muscles beneath it to a more youthful position but does not result in tighter facial muscles. A  SMAS facelift should not  cause additional complications  your TMJ problems when properly done.  I would consult with your  TMJ specialist to be sure.

It sounds like you have a few issues.  I am happy that you have reasonable control of your TMJ symptoms.  The facelift should not effect that.  I would wait a little while before resuming aggresssive PT for your TMJ.  The contour irregularity can also be evaluated by your surgeon and see what he/she may suggest. 

Facelift surgery involves the tissues more superficial than the jaw joint so your TMJ disorder isn't a contra-indication to surgery. Facelift surgery wouldn't be expected to improve the cheek indentation you mentioned, though you may want to discuss filler options for this area such as fat grafting or injectible filler.

As long as your TMJ is stable, you should probably be okay.  However, the TMJ may worsen after the facelift because of the pulling of the skin.