Il Callo Osseo Normale e Patologico (1955) by Prof. Pasquale Del Torto is a specialized orthopaedic monograph examining the biological processes and clinical features of normal and pathological bone callus formation. The text explores the phases of fracture healing, cellular mechanisms, and deviations leading to hypertrophic, atrophic, or fibrous callus, drawing from clinical cases and histological analysis. Intended for orthopaedists, pathologists, and medical researchers, it contributes to mid-20th-century understanding of bone repair physiology and complications in post-traumatic skeletal recovery.