The crack may affect only one side, but it is not uncommon to have fractures on both sides of the vertebra. However, an injury can occur too quickly for the vertebra to be repaired, and this leads to a crack in the pars. The vertebra initially responds to increased physical strain of such activity by gradually adding new bone cells around the stressed area of the spine. Illustration of cross-section of spine, dorsal (back to front) and lateral (side) views, showing its vertebral sections. In football players, it is especially common in offensive and defensive linemen. It is also common in soccer, lacrosse and basketball players. In athletes, this type of injury can be seen when the back is bent backwards repeatedly, in activities such as gymnastics, karate and other martial arts. Pars fractures most commonly occur in the lowest lumbar vertebra (L5) of the lower back (lumbar spine). Where in the spine is spondylolysis most common? Active kids and teens with spondylolysis may experience symptoms, however, some people with this condition may not develop symptoms until later in adulthood. Spondylolysis is a common condition of children and teenagers who are involved in organized sports. Spondylolysis is the most common cause of structural back pain in children and teenagers. These stress fractures in the back are most often seen in adolescent athletes such as gymnasts, where there is a great deal of extension and landing with an arched back. In other words, it is usually a stress fracture rather than a sudden break. Spondylolysis usually occurs during childhood or adolescence from repetitive stress, rather than from an acute injury. ![]() Figure 2: Top view of spinal column What causes spondylolysis?
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