There are a number of reasons why some people are particularly disposed to osteoarthritis. However, as with nearly all abnormal conditions affecting the body, it is likely that a combination of risk factors work together to cause osteoarthritis. Repetitive trauma to the spine from repetitive strains caused by accidents, surgery, sports injuries, poor posture, or work-related activities are common causes of spinal arthritis.

Risk Factors for Spinal Arthritis
Athletes and people with jobs that require repetitive, and particularly heavy, motion have been found to be at greater risk. Other known risk factors for developing spinal arthritis include:

Excess weight: causing more stress on weight-bearing joints and the spine, particularly during the middle age years
Genetics: having a family history of osteoarthritis or congenital defects of joints, spine, or leg abnormalities
Associated diseases: the presence of other associated diseases, infections, diabetes, rheumatoid arthritis or gout
Aging: steady and advanced aging of spinal structures, beginning in the 30s, often work-related
Gender: osteoarthritis being more common in post-menopausal women