Distinction between spondylosis spondylolisthesis and spondylolysis

What is the distinction between spondylosis spondylolisthesis and spondylolysis? 

Spondylosis is a nonspecific degenerative process of the spine, often due to osteoarthritis with osteophyte formation. 

Spondylolisthesis refers to anterior subluxation of one vertebral body on another. 

Spondylolysis is a defect in the pars interarticularis that allows the vertebra to slip upward.

All three of these conditions may cause pain when symptomatic and can be confirmed radiographically.

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