What is the usual cause of compression fractures in the spine?

Osteoporosis: The usual cause of compression fractures in the spine is osteoporosis -- low bone mass that usually occurs after menopause in women but it can occur in men after testosterone levels have dropped or for anyone on certain medications that interfer with bone metabolism. Adequate intake of calcium and vitamin d along with exercise can slow progression but one should check with their physician.

Several causes : Compression fractures can occur from trauma ( falls, MVAs, ATV crashes ) or from osteoporosis allowing fractures to occur with less strenuos activities or falls.