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Wallis Spine Implant
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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 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
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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
Biomechanical principles:
Wallis relieves pain by increasing the rigidity of the unstable segment,
while preserving its mobility. |
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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
Biomechanical principles:
Wallis relieves pain by increasing the rigidity of the unstable segment,
while preserving its mobility. |
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The
design and materials minimize need for bony resection and avoid any
concentration of constraint on the bone:
 Anatomic
design: 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,
Elasticity:
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.
Indications include;
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Voluminous herniated disc in young adults
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Recurrent herniated disc
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Herniated disc accompanying an L5
sacralization transitional anomaly
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Degenerative disc disease at a segment
adjacent to fusion
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Modic I degenerative lesions
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Lumbar canal stenosis treated by partial
laminectomy
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Contact
Stenum Hospital for an evaluation
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