This non-fiction medical volume by Ettore Ruggieri is part of a broader treatise on surgical semeiotics and diagnostics, with Volume IX focusing on diseases of the limbs. Published in 1976, the work reflects a mature phase of clinical methodology, emphasizing diagnostic reasoning, symptom interpretation, and the correlation between clinical signs and underlying pathology. It likely addresses vascular, neurological, traumatic, and degenerative conditions affecting upper and lower limbs. The structure is systematic, guiding practitioners through examination techniques and differential diagnosis. The book contributes to the consolidation of modern diagnostic frameworks within surgical and orthopaedic practice.