Surgery for degenerative lumbar lesions is undergoing a metamorphosis with the current emergence of the step-wise surgical strategy concept to treat chronic intractable lumbar pain when conservative treatment fails. Mechanical supplementation with non-rigid fixation clearly appears to be a useful technique in the management of initial forms of degenerative intervertebral lumbar disc disease. This method should rapidly assume a specific role along with total disc prostheses or ADR in the new step-wise surgical strategy to obviate definitive fusion of degenerative intervertebral segments.
We began studying and developing non-rigid stabilization of lumbar segments in 1984. The clinical trials of the first-generation implant provided evidence that the interspinous system of non-rigid stabilization effectively treats low-back pain due to degenerative instability and is free of serious complications
Today the second generation has been developed after careful analysis of the points that could be improved on the first-generation implant. This new implant, called Wallis, treats the pain due to degenerative instability, preserves mobility, anatomy and stability while being fully reversible, therefore leaving all subsequent options open.
Wallis relieves pain by increasing the rigidity of the unstable segment, while preserving its mobility.
The design and materials minimize need for bony resection and avoid any concentration of constraint on the bone:
notches that fit the physiological shape of the spinous processes,
Optimization of the Surface of Contact
flat band for best spread of constraints in contact with the bone,
spacer and clips made of PEEK for mechanical properties close to those of bone and openings in the spacer for maximum reduction of the implant rigidity.
- Voluminous herniated disc in young adults
- Recurrent herniated disc
- Herniated disc accompanying an L5 sacralization transitional anomaly
- Degenerative disc disease at a segment adjacent to fusion
- Modic I degenerative lesions
- Lumbar canal stenosis treated by partial laminectomy
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