The body looks at this as toxic and if it gets absorbed, the liver deals with it mostly as a toxin rather than a nutrient. Eating the chalk will put a large quantity of this material in your body and is not a good idea at all.
This operation can be done either through the same incision as the medial patellofemoral ligament reconstruction or through a larger incision around the knee. It allows the patella to sit more centrally within its groove and not tilt as the patella engages in the trochlear groove.
Patella maltracking, or patellofemoral pain syndrome, is an imbalance in the gliding of the kneecap that aggravates cartilage behind the knee. Rather than gliding vertically as the knee bends, a maltracking patella is pulled to the outward side as it moves upward in the groove. This may result in pain on the outward and front sides of the knee, clicking sounds, swelling, and pain from both activity and long bouts of sitting.