Thank you for your question. The short answer is "no". There are different variations of the traditional Tummy Tuck. In some cases no muscle will need repair, just redundant skin will be removed. When you have a physical examination with your plastic surgeon, he or she will suggest what will be the best option to give you the optimal result. All the best to you
The simple answer is that most patients needing a tummy tuck have a degree of muscle separation (diastasis) that should be repaired, but there are some that do not. It is usually related to pregnancy, so weight loss patients without prior pregnancy are less likely to need it. Sometimes it is only the lower muscles that separate, and if there is a C-section then they might repaired as part of the routine closure. Overall I do a muscle repair in about 90% of patients but if it is not needed then the recovery is quicker.