• Carles Pedret
  • Ramon Balius
  • Angel Ruiz-Cotorro


Spondylolysis is a bone defect that affects the pars interarticularis of a vertebra (Fig. 30.1). The pars interarticularis is a small isthmus located between the facet joints of the vertebrae above and below. This usually occurs on a bilateral basis, affecting the L5 (85–95%) and on rarer occasions affecting the proximal lumbar vertebrae, the affectation of which is usually unilateral. An isthmic unilateral lesion is observed in 14–30% of cases. It may be associated with injuries at other levels or with lysis on the contralateral side, which develops over time. Although it is rare, it may affect several levels simultaneously.


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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Carles Pedret
    • 1
    • 2
  • Ramon Balius
    • 3
    • 1
  • Angel Ruiz-Cotorro
    • 1
    • 4
  1. 1.Clínica Mapfre de Medicina del TenisBarcelonaSpain
  2. 2.Clínica DiagonalBarcelonaSpain
  3. 3.Consell Català de l’Esport, Generalitat de CatalunyaBarcelonaSpain
  4. 4.Real Federación Española de TenisBarcelonaSpain

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