Stabilization System Reduces Stress on Spine

Since there is no bony purchase or fixation the system is fully reversible, thus leaving subsequent options open. The design of the system minimizes the need for bony resection, and permits an even distribution of stresses on the bone, using grooves that fit the physiological shape of the spinous processes. A spacer and clips made of polyether ether ketone (PEEK) provide mechanical properties close to those of bone and openings in the spacer for maximum reduction of the implant rigidity. Optimization of the contact surfaces is achieved using a flat polyester band that improves the stress pattern on the bone. The UniWallis implant also offers surgeons the ability to perform surgery from a unilateral approach, preserving the supraspinous ligament.

The system is based on a load-sharing effect; the spacer implant reduces the intradiscal pressure and stresses in a damaged disc in both flexion and extension. During flexion movements, the bands limit the amplitude of the movement without eliminating it, controlling the mobility of the affected segment. During extension movements, the spacer controls the mobility of the affected segment without altering the mechanical behavior of the adjacent segment. The system increases the rigidity by a factor of 1.9 and 1.5 times in inflexion and extension, respectively. The UniWallis Dynamic Stabilization System is a product of Zimmer Spine (Bordeaux, France), and has received the European Community (EC) marking of approval.

"The launch of the new UniWallis System offers surgeons a redesigned and reinforced approach to increasing patient mobility," said Steve Healy, President of Zimmer Spine. "The broad array of implant sizes available with the UniWallis System allows us to improve the lives of an even wider range of patients."

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