taken from their homepage:
The risk of developing Asherman’s from a D&C is 25% 2-4 weeks after delivery (5-8). D&Cs also lead to Asherman’s in 30.9% of procedures for missed miscarriages and 6.4% for incomplete miscarriages (2). Asherman’s risk increases with the number of D&Cs performed; after a single termination the risk is 16% however after 3 or more D&Cs the risk jumps to 32%. (9). Each case of Asherman's Syndrome is different, and cause must be determined on a case-by-case basis. In some cases, Asherman's may have been caused by an "overly-aggressive" D&C. However, this is not often considered to be the case. The placenta may have attached very deeply in the endometrium or fibrotic activity of retained products of conception could have occurred both of which make it difficult to remove retained tissue without causing injury to the basal endometrium.