NexGen® Legacy® Constrained Condylar Knee (LCCK)

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The NexGen® LCCK is intended for patients who, in the surgeon's judgment, require additional stabilisation due to inadequate mediolateral, anteroposterior, and varus/valgus ligament function, and require augmentation and/or stem extensions due to inadequate bone stock. The NexGen LCCK System can be used with augments, stem extensions, and Trabecular Metal™ cones. The Zimmer Biomet NexGen LCCK System offers a reported survivorship of 96% at 10+ years when used for revision TKA.1

Constraint

For patients who lack functional collateral ligaments or whose knees cannot be stabilised by the usual tissue releases, the LCCK features an elevated tibial spine and deeper femoral intercondylar box. A close fit between the spine and box provides stability as the mechanical rollback is induced, inhibiting posterior subluxation and limiting varus/valgus movement to +1.25º and internal/external rotation to +2º. This design accommodates a theoretical range of motion in excess of 120º.

Tibial and Femoral Augments

For patients with inadequate bone stock, tibial and femoral augments offer true patient specificity. Tibial augments are 5mm-20mm blocks in 5mm increments offered in titanium or up to 30mm in Trabecular Metal  material. Femoral augments are posterior, distal, posterior/distal, and anterior augments. Augments are designed for either screw or cement fixation with the exception of the anterior augments, which are cement fixation only. These are available in either titanium or Trabecular Metal material.

Stems

Interchangeable between all stemmable NexGen tibial and femoral components, straight and offset stem extensions allow the surgeon to optimise canal fill and component positioning.

For patients whose canal is not centred relative to the distal femur or proximal tibial surface, the offset design allows the component to be positioned 4.5mm away from the centre of the canal in any direction. This flexibility provides for a full 360º of orientation for improved bone coverage, and allows the surgeon to optimise implant position.

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References

  1. Kim YH, Kim JS. Revision total knee arthroplasty with use of a constrained condylar knee prosthesis. J Bone Joint Surg Am. 2009;91(6):1440-1447.

 

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Zimmer, Inc.
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Warsaw, Indiana 46580 USA

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