What is involved if obese and get a Tummy Tuck for muscle separation?

Thank you for sharing your question. Typically a muscle tightening is performed at the time of a tummy tuck to help obtain a flatter stomach appearance.  There is no reason to repair any muscle separation until you have lost weight and lowered your risks of surgery.  If however the muscle separation is a hernia, this may require a repair depending on your current symptoms.  Even in cases of a hernia it is wise to lose weight first (if possible) before repair as it will minimize your risk of recurrence.  Hope this helps.

Thank you for the question. 
Generally speaking, it is always best to achieve long-term stable weight prior to proceeding with body contouring surgery. Doing so, will increase the safety of the operation, will likely improve the outcome of the operation (best chance to achieve an optimal aesthetic outcome), and will decrease chances that additional surgery will become necessary subsequently. 

In my practice, I do not ask specific patients to achieve a specific weight prior to proceeding with tummy tuck surgery. I simply ask patients to achieve a long-term stable weight where he/she feels comfortable and does not expect significant fluctuation postoperatively. 

Having said that, there are a subset of patients who  are above the ideal long-term stable weight who benefit from panniculectomy surgery. The panniculectomy operation involves excision of the lower abdominal wall pannus or overhanging skin/adipose tissue. It is not considered an  aesthetically driven procedure;  it is often performed to help with concerns such as skin breakdown, infections/rashes… 
 
The vast majority of patients who have had children and/or weight gain/loss benefit from muscle plication during tummy tuck surgery. Muscle laxity is usually easy easily determined with physical examination prior to surgery. The separation is also easily visualized during surgery.

When the time is right, seeking consultation with well experienced board-certified plastic surgeons will  be your next/best step.  Best wishes.