Santa Syndrome -
Spondylolysis And Spondylolistesis
This pathology is a also named Santa syndrome... Ho Ho!
The terms referring to these pathologies derive from ancient Greek. Spondylolysis sphondylos + lysis (vertebrae + rupture) and Spondylolisthesis sphondylos + olisthanein (vertebrae + falling) mean respectively, the fracture and the forward displacement of one vertebra relative the vertebra below.
Spondylolisthesis can have various origins, including overuse - typical intensive Santa's activities that put extreme pressure on the spine (carrying heavy Christmas presents, toys, electrical appliances, etc).
Spondylolysis is essentially a stress fracture caused by repeated strains to the lower back.