Spondylolysis

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Not to be confused with spondylosis or spondylolisthesis.

Spondylolysis is a defect in the pars interarticularis of a vertebra. The great majority of cases occur in the lowest of the lumbar vertebrae (L5), but spondylolysis may also occur in the other lumbar vertebrae, as well as in the thoracic vertebrae.

Spondylolysis occurs in three to six percent of the population. It is typically caused by stress fracture of the bone, and is associated with certain activities, such as weight lifting and gymnastics. It has been proposed that the pars interarticularis is especially vulnerable when the spine is in an extended position, and a force suddenly presses the vertebrae together, such as when landing on ones feet after a hop. This pressure acts like a nutcracker on the pars interarticularis and can fracture it in susceptible individuals. [1]

Spondylolysis also runs in families and is more prevalent in some populations, suggesting a hereditary component such as a tendency toward thin vertebral bone.

http://www.gentili.net/signs/images/400/spinescottyparsdefect.JPG <-- Picture of x-ray. An oblique x-ray of the lumbar spine shows what appears to be a "scotty dog" first described by Lachapelle. The nose of the dog is the costal/transverse process; the ear, the superior facet; the neck, the pars interarticularis; the collar, the pars defect (dark on x-ray); the eye, the pedicle seen end on; the body, the lamina; the hindefoot, the spinous process; the tail if pointing straight up=opp. superior articular facet and if pointing horizontally is the transverse process of the opposite side; and the forefoot, the inferior articular process. From http://lonestarspineinc.com/glossary.html and http://www.drbackman.com/x-ray-spondylolisthesis.htm

Spondylolysis is the most common cause of spondylolisthesis. The hereditary factor mentioned above is quite notable, since the frequency of spondylolisthesis in Eskimos is 30-50%.