Symptom-focused care of the PDLS -- Fundamental anatomy -- Spino-pelvic parameters and sagittal balance -- Stabilization in SFC surgery on the PDLS -- Clinical evaluation of the patient with a PDLS -- The fundamental open surgical method -- Lateral intramuscular planar [Limp] approach for instrumentation/stabilization L3 to sacrum -- Minimally invasive surgical method -- Post-operative care -- Surgical situations of complex decision-making -- Socio-economics in spine surgery.