Posterior-Only Sagittal Correction in Degenerative Lumbar Kyphosis Using Posterior Interpedicular Osteotomy (PIO) and Bilateral Discectomy with Hyperlordotic Cages: A Retrospective Case Series - Andrea Franchini; Giuseppe Rovere; Felice Barletta; Franco Lucio Gorgoglione; Giovanni Noia; Giuseppe Maccagnano; Andrea Perna (Journal of Personalized Medicine, 2026)