Physicians

ADVANCE® Unicompartmental Knee

Remove the guesswork without removing quality bone

With the increased prevalence of unicompartmental knee arthroplasty (UKA), a system which provides a conservative approach in terms of both instrumentation and implant design is critically important.

To address this, the ADVANCE® Unicompartmental Knee System was designed with bone conserving femoral and tibial components that provide reproducible results within a minimal incision.

This was accomplished with the following three system design requirements:

• Conservation

  The resurfacing femoral implant conserves 20% more quality bone stock compared to contemporary full resection femoral implants.¹ An all-poly tibial base design conserves bone while providing proven outcomes based on cortical bone support in place of inlay techniques.¹²

• Simplicity

  State of the art instrumentation allows precision resurfacing while remaining versatile and straight-forward. Through the use of guides at every step of the procedure, intraoperative simplicity is assured while surgeon confidence is maintained.

• Consistency

  Consistent alignment and reproducible clinical results are obtained through an instrumented minimal incision technique. Increased tibial implant fixation and more consistent clinical outcomes are provided with a dual peg tibial base design.⁴

• Conservative incision with consistent precision

  UKA systems designed for minimal exposure have historically provided either limited instrumentation, making reproducible alignment difficult, or bulky instrumentation, which requires more intrusive surgery.

  The goal of the ADVANCE® System was to provide instruments that could be effectively used in a minimal incision procedure while still offering the surgeon the alignment guides needed for consistent results. Reproducible alignment and consistent results are possible within a minimal incision when we put the right tools in the surgeon's hands.

  
  One piece posterior resection and distal resurfacing guides are anatomically designed for preparation of the medial or lateral femoral condyles.

  
  A precision femoral rasp guide may be utilized with a revolutionary end-mill or low-profile power rasp to resurface the femur and provide unprecedented implant fit.

  
  Low profile tibial guide and stylus are easily applied in small incision surgery.

  
  Angled drill guides allow for posterior tibial peg preparation within the confines of a minimal incision.

• Consistently resistant

  Failures due to tibial implant loosening have been the primary cause of revision in UKA over the past decade.^10,11 To improve this area of UKA implant design, an implant based on optimal cement fixation was incorporated into the ADVANCE® Unicompartmental Knee System.

• Mechanical testing

  Three potential tibial base undersurfaces were tested in both torsional and distraction pull-out tests to replicate the forces found in the anatomic knee. Testing confirmed the dual peg design with a peripheral rim provided the highest disassociation forces and the optimal attributes for cemented fixation.⁴

• Cortical consistency

  Historically, long-term tibial implant survivorship and fixation have been accomplished by systems utilizing a proximal tibial resection and cortical tibial rim support.^12,13 To build on this success, the ADVANCE® Knee System was designed for onlay fixation with a proximal tibial resection. Cortical tibial support and dual peg design provide increased fixation based on long term clinical success and address concerns with potential cancellous bone subsidence reported with inlay techniques.^12,13

• Consistently on track

  By providing a constant sagital radius beyond 10 degrees of flexion, in combination with a 7 degree angled anterior-posterior geometry, the ADVANCE® Unicompartmental Knee reproduces the anatomy of the natural femur.^5,6 With the normal circular anatomy and kinematics restored, the ADVANCE® Uni-Knee femoral component is designed to articulate along the mid-point of the tibial component throughout a range of motion.

  
  The 7° anatomic femoral shape provides maximum implant coverage without medial implant overhang.

  
  Anatomic tibiofemoral tracking restores normal motion and maximizes implant congruency throughout flexion.