Definition of dynamisation

Dynamisation: The mechanical load transferred across a fracture locus can be increased, at a certain healing stage, in order to enhance bone formation, or to promote "maturation" of the healing tissues. An example would be the reduction in stiffness of an external fixation, either by loosening some clamps, reducing the number of pins, or moving the tubular construct further from the bone. Early dynamisation, i.e. before solid bridging of the bone, can result in stimulation of callus formation. The value of later dynamisation is debatable.

Pin fixators

Advantage: routine work, stabilises diaphyseal fractures, good wound access.

Disadvantages: requires reduction, limited angulatory and rotatory deformities, no axial loading permitted, high incidence of union or non-union, angulatory deformities in bone lengthing, no progressive correction allowed.

• Pin: Schanz screw/half-pin,Steinmann pin
• Clamp
• Central body
• Compression and distraction system