Historical overview and rationale for dynamic fusion

The history and rationale of posterior dynamic spinal fusion devices has been derived through the experiences with arthrodesis and devices that serve as adjuncts to such procedures. Dynamic fusion devices provide stabilization through immediate fixation while allowing load sharing. Historically, incorporating these two important concepts in surgical techniques along with the implanted devices facilitates the bone healing process. It stands to reason, spinal fusion techniques that provide immediate stabilization and simultaneously significant graft loading should have the same clinical success seen in other long bone and cervical spine arthrodesis techniques. The load-sharing capability is device-dependent and posterior dynamic constructs theoretically allow dynamic compression of the anterior column higher than that of traditional rigid rod fixation.