The first AO manual

October 15, 2026

By bringing principles, instruments, indications, and operative techniques together, the first AO manual helped turn the experience of a small group of surgeons into knowledge that could be studied, taught, and shared.
 

When the AO was founded in 1958, operative fracture treatment remained controversial. Internal fixation—stabilizing a broken bone surgically with implants inside the body—was not new, but earlier attempts had been associated with infection, unreliable implants, and inconsistent techniques.

The early AO surgeons therefore approached fracture treatment as more than an implant problem. Research investigated bone healing, clinical documentation allowed results to be reviewed, standardized instruments supported defined techniques, and courses taught surgeons how the different elements worked together. What was still needed, however, was a comprehensive reference that brought this growing body of knowledge together.

Putting the AO approach on the page

That reference appeared in 1963: Technik der operativen Frakturenbehandlung was written principally by Maurice Müller, Martin Allgöwer, and Hans Willenegger, with contributions from other members of the early AO network. Although the word “manual” did not appear in its title, the 361-page book is regarded as the first comprehensive publication to set out the group’s developing approach to operative fracture treatment.

It addressed the rationale and risks of internal fixation, instruments and implants, operative and postoperative management, follow-up, and the treatment of fractures in different anatomical regions. Its 459 illustrations were particularly important. Surgical knowledge that might otherwise have been demonstrated only in an operating room or during a course could now be shown step by step and revisited later.

Taking the AO approach beyond Davos

Publication also created another way for AO knowledge to travel. What had begun as a German-language attempt to make operative fracture treatment reproducible soon became part of a wider translation effort, helping surgeons in different countries study the same principles, instruments, indications, and operative steps in their own languages.

A revised English edition, Technique of Internal Fixation of Fractures, followed in 1965, making the material accessible to a wider international readership. But English was only one step in the process. As AO education expanded beyond Switzerland and its early European network, the manual and related AO teaching materials were translated, adapted, and discussed across linguistic communities, supporting the spread of a shared surgical vocabulary well beyond Davos.

In 1969, Manual der Osteosynthese: AO-Technik appeared in German. Its authors described it as a response to continuing demand for a description of the AO technique after the 1963 book had gone out of print. Rather than simply repeating earlier material, it reflected the AO’s continuing effort to keep written guidance connected to teaching, research, instrumentation, and clinical experience.

An English translation, Manual of Internal Fixation: Technique Recommended by the AO-Group, followed in 1970. Subsequent editions added new instruments, research findings, clinical experience, and developments in fracture treatment, while AO education increasingly used complementary formats such as classification systems, course materials, images, videos, and digital resources.

Today, AO knowledge moves through a global network that extends far beyond any single publication. Courses, fellowships, research, documentation, faculty exchange, online learning, clinical guidance, and specialty-specific communities all help carry AO principles into practice. The first books remain historically important because they established a common illustrated reference; the wider AO system now continues that work across continents, languages, specialties, and formats.

A system designed to evolve

That broader system also shows why the first AO manual matters. Its significance lies not only in what it recorded in 1963, but also in the model it helped establish: surgical knowledge should be documented clearly, tested in practice, and revised when research, technology, and clinical experience move forward. The terminology and understanding of the AO principles changed as well. This willingness to update documented knowledge when evidence and experience demanded became an important part of the AO approach.

More than six decades later, the formats used to share surgical knowledge have changed dramatically. Yet the underlying task remains familiar: connecting evidence, practical technique, education, and appropriate tools so that knowledge can be documented, taught, and kept open to revision.