The reasons for such a clear-cut answer will immediately become clear if one keeps in mind what diastasis is: a alteration of the dawn linewhich becomes very thin and widens, resulting in the separation of the rectus muscles (figure below: on the left a normal abdomen, on the right an abdomen with diastasis of the rectus). Diastasis, therefore, is a irreversible anatomical alterationIn order to cure it, physiotherapy would have to restore elasticity to the linea alba to make it 'contract' and 'shrink', which is obviously impossible.
Even in those patients with very small diastases or sub-diastatic muscle separations (i.e. less than 2.5 cm), the 'healing' after physiotherapy is only apparent; in these cases, physiotherapy has restored tone to the rectus muscles that have come closer together, but has not acted on the linea alba: in fact, if the muscle tone is reduced, in these patients the diastasis reappears.
Only surgery can permanently reshape the linea alba and reconstruct the normal geometry of the abdominal muscles.
Physiotherapy plays a key role before surgeryto prepare the abdominal wall for surgery, and after surgeryto restore the muscles of the"abdominal core"(abdominal muscles + muscles of the spine + muscles of the pelvic floor) the correct tone and trophism.