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Zimmer, Inc.

Wallis® Posterior Dynamic Stabilizsation System

Product Description

Wallis Posterior Dynamic Stabilization Device

Preserves the anatomy, keeps option open for later treatment

  • PEEK-OPTIMA®* spacer design minimizes need for bony resection
  • Polyester bands permit an even distribution of stresses on bone

Preserves mobility

  • Load sharing effect 
  • Limits amplitude of movement and increases rigidity in Flexion and Extension
Reduces intradiscal pressure 

Features

Treat the pain

Surgery for degenerative lumbar lesions is undergoing a metamorphosis with the emergence of the non-fusion 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-by-step 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(1) 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 implant, called Wallis Posterior Dynamic Stabilization Device , treats the pain due to degenerative instability, preserves mobility, anatomy and stability while being fully reversible, therefore leaving all subsequent therapeutical options open.

1. «Long-term actuarial survivorship analysis of an interspinous stabilization system» Sénégas J, Vital JM, Pointillart V, Mangione P; Eur Spine J (2007) 16:1279-1287.
«Clinical evaluation of a lumbar interspinous dynamic stabilization device (the Wallis System) with a 13-year mean follow-up» Sénégas J, Vital JM, Pointillart V, Mangione P; Neurosurg Rev (2009) 32:335-342.

Indications

The Wallis Posterior Dynamic Stabilisation System treats low-back pain that accompanies degenerative lesions of grade II, III and IV (Pfirrmann MRI classification)(1) in the following indications:

  • Massive 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
  • Degenerative lesions with or without Modic 1
  • Lumbar canal stenosis treated by laminotomy (not by complete laminectomy)(2)

Contraindications

  • Stage V degenerative  lesions in Pfirrmann’s MRI classification (remove disc)
  • Spondylolisthesis
  • Osteoporosis
  • Non-specific low back pain
  • Modic 2 and Modic 3 changes

References

  1. Pfirrmann CWA, Metzdorf A, Zanetti M, Hodler J, Boos N (2001) Magnetic resonance classification of lumbar intervertebral disc degeneration. Spine 26:1873-1878.
  2. Important: If the procedure includes enlargement of a stenotic lumbar canal by resection of the upper portion of the laminae, make sure to preserve sufficient spinous process thickness.

PEEK-OPTIMA® Polymer is a trademark of Invibio Ltd.