There's been an epidemic of vitamin D deficiency over the last few decades because we've been avoiding the sun, Volgman says. Other reasons include having a milk allergy, following a strict vegetarian meal plan, and having darker skin (the pigment melanin reduces the skin's ability to make vitamin D from sunlight).
Sacral fractures - Denis classification. Zone 1: Region of the ala. Zone 2: Region of the sacral foramina. Zone 3: Region of central sacral canal. Provide an explanation for key principles and pertinent aspects of the classification. Provide the citation for the landmark article and recent review articles describing the classification.
There are many types of fractures, but the main categories are complete, incomplete, compound and simple. Complete and incomplete fractures refer to the way the bone breaks. In a complete fracture, the bone snaps into two or more parts; in an incomplete fracture, the bone cracks but does not break all the way through.