Wedge fractures are the most common fractures and occur most frequently at the midthoracic and thoracolumbar regions in both men and women. Crush fractures also have a higher tendency to occur in the midthoracic and thoracolumbar regions. Unlike other types of fractures, biconcave fractures are equally as likely to occur in lower lumbar vertebrae as at other spinal locations.

http://www.google.com.eg/imgres?imgurl=http://www.osseon.com/media/images/Vertebral-Fracture-Variations3.0.jpg&imgrefurl=http://www.osseon.com/patient-education/vertebral-compression-fractures/&usg=__VBKQEcYm5Z0voYuy75MmsbPgzxg=&h=233&w=429&sz=26&hl=en&start=13&sig2=nffz1kCLgXT2wEnyjvwuhA&um=1&itbs=1&tbnid=S-Wzj-yIQ5BWcM:&tbnh=68&tbnw=126&prev=/images%3Fq%3Dvertebral%2Bfracture%26um%3D1%26hl%3Den%26sa%3DG%26rlz%3D1T4RNTN_enEG364EG364%26tbs%3Disch:1&ei=-ioQTIr0CY6g4Qai6tTtDA

figure:Lumbar spine radiograph (two projections): A compressed fracture can be seen in the the second lumbal vertebra (arrows), which is anteriorly narrowed in a wedge shape. Corresponding to the fractured lumbal vertebra, a gibbus can be observed.
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Fractures of the bony spine are most commonly related to automobile or motorcycle accidents. There may be associated spinal cord injury. Traumatically fractured vertebrae are treated with a combination of surgical fusion and sometimes stabilization with metal rods.

http://www.jamesdisabilitylaw.com/back-injuries.htm#Degenerative_Disc_Disease_(DDD)