Muscle contractions then push the stool toward the rectum, and, by the time the stool reaches the rectum, most of the water has been absorbed, making the stool solid. When the colon's muscle contractions are slow or sluggish, the stool moves through the colon too slowly, resulting in too much water being absorbed.
The microparticulate allograft is a mixture of mineralized cortical bone particles of a standard combination of sizes between 100 and than 250 microns. This provides an optimal scaffold for delivering osteoinductive growth factors. This preparation has an appropriate 3-dimensional (3-D) structure
microparticulate allografts would induce healing of bone defects in a manner similar to autografts. Freeze-dried mi-croparticulate allografts were chosen because they were shown to incorporate faster than frozen microparticulate al-lografts [7]. Likewise cortical bone particulate allografts with particle sizes from 300 to 90 were shown experimen-