Muller lays out the founding principles of the AO/ASIF group for internal fixation of fresh fractures and non-unions. He argues that anatomic reduction plus absolute stability allows immediate mobilization and prevents 'fracture-disease.' The paper introduces the concept of primary bone healing and defends interfragmentary compression using clinical series and animal experiments.
This paper is the clinical articulation of the AO principles you rely on every day: anatomic reduction, absolute stability, preservation of blood supply, and early mobilization.
The core teaching point is the distinction between primary (direct) and secondary (callus) bone healing. Absolute stability abolishes micromotion and lets bone remodel directly across the gap with no visible callus. This is the mechanism behind lag-screw and compression-plate constructs.
Two technique pearls remain testable and true. Lag screws need a fracture line at least twice the shaft width, and you generate compression by over-drilling the near cortex (gliding hole) while tapping the far cortex (thread hole).
Read the Nicol discussion carefully. He concedes rigid fixation can unite non-unions without graft, but insists rigidity, not compression, is the operative factor, and he warns against fixing the subcutaneous tibia routinely. That debate over compression versus stability, and over suppressing periosteal callus, framed decades of AO research.
Muller lays out the founding principles of the AO/ASIF group for internal fixation of fresh fractures and non-unions. He argues that anatomic reduction plus absolute stability allows immediate mobilization and prevents 'fracture-disease.' The paper introduces the concept of primary bone healing and defends interfragmentary compression using clinical series and animal experiments.
This paper is the clinical articulation of the AO principles you rely on every day: anatomic reduction, absolute stability, preservation of blood supply, and early mobilization.
The core teaching point is the distinction between primary (direct) and secondary (callus) bone healing. Absolute stability abolishes micromotion and lets bone remodel directly across the gap with no visible callus. This is the mechanism behind lag-screw and compression-plate constructs.
Two technique pearls remain testable and true. Lag screws need a fracture line at least twice the shaft width, and you generate compression by over-drilling the near cortex (gliding hole) while tapping the far cortex (thread hole).
Read the Nicol discussion carefully. He concedes rigid fixation can unite non-unions without graft, but insists rigidity, not compression, is the operative factor, and he warns against fixing the subcutaneous tibia routinely. That debate over compression versus stability, and over suppressing periosteal callus, framed decades of AO research.