Félix Lagrange was a prominent French surgeon and medical author known for his contributions to orthopedic surgery and ophthalmology. His notable works include 'Traitement de l'ankylose du genou,' a thesis that showcased his expertise in knee conditions and was presented for the prestigious agrégation in surgery at the Faculty of Medicine in Paris. This work highlighted the complexities of joint treatment and solidified his reputation in the medical community. In addition to his focus on knee ailments, Lagrange also addressed the impact of war on health, particularly through his work 'Fractures of the orbit and injuries to the eye in war.' This publication examined the specific injuries sustained by soldiers, reflecting the broader medical challenges faced during wartime. Lagrange's writings contributed significantly to the understanding of surgical techniques and the treatment of trauma, influencing future generations of medical professionals in the fields of surgery and ophthalmology. His legacy endures through his scholarly contributions that bridged the gap between theoretical knowledge and practical application in medicine.