Von Mises stresses at pars interarticularis were analyzed in the six degrees of lumbar motion with 400 N axial compression, which simulates the standing position. The range of motion at L4/5 and ...

Figure 4. Spondylolysis; stress fracture of the pars interarticularis as seen on oblique radiograph. Figure 5. Oblique radiograph showing obvious L-5 spondylolysis.

Background: Active spondylolysis is an acquired lesion in the pars interarticularis and is a common cause of low back pain in the young athlete. Objectives: To evaluate whether the one-legged ...

The basic lesion in isthmic spondylolisthesis is in the pars interarticularis. Wiltse et al divided this category into three subtypes: lytic, elongated, and acute fracture.