Orthopaedics MCQ MCQ #1952 Medium What is the primary aetiology of Type I spondylolisthesis according to the Wiltse classification? A Congenital dysplasia of the upper sacrum and L5 neural arch B Stress fracture of the pars interarticularis C Degenerative changes in the facet joints D Traumatic injury to the vertebra Check answer Practice more MCQs Explain further