The prevalence of osteoporotic fractures is indicated below:

Vertebral fractures 46%
Wrist fractures 16%
Hip fractures 16%
Others (arms, legs and ribs) 22%

A vertebral fracture can be defined "as the reduction of one of the vertebral heights by 20%, compared to a reference vertebral height". These heights can be the posterior vertebral height, the mid vertebral height or anterior vertebral height.

Vertebral Heights & Fractures

Fractures are classified as:

Normal Normal fracture
Wedge Wedge fracture
Concave Concave fracture
Compression (crush) Compression (crush) fracture