Freedom® Constrained Acetabular Liners

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Zimmer Biomet’s Freedom® Constrained Liner System offers a solution for patients who present with repeated dislocations and hip instability.

Traditionally, these patients have been forced to accept severely limited range of motion in order to maintain a stable joint. However, with Freedom Constrained Liners, surgeons can provide stability in the hip joint and maintain range of motion.

  • Simple instrumentation 
  • 5 distinct liner options
  • Tri-Mode constraint for superior stability and range of motion
  • Can be used with any Zimmer Biomet G7® and RingLoc® Acetabular shells for maximum intra-operative flexibility
  • Available in +5, 10-degree, and low-profile designs
  • 6 non-skirted neck lengths (including +9) to address soft tissue laxity and leg length discrepancies easily 

While hip arthroplasty may at times present unusual technical challenges, the Freedom Constrained Acetabular Liner System offers surgical latitude and a compelling answer for treating the unstable hip joint without sacrificing range of motion.

Product Features

Zimmer Biomet’s Freedom Constrained Liner offers a high level of constraint for joint stability without the trade-off of having to sacrifice range of motion. A versatile implant system tailored to meet patients’ needs, the Freedom System has performed well in clinical trials, resisting dislocation in the early term when patients are most prone.1-3

Freedom Constrained Acetabular Liners feature:

  • 36mm head for range of motion up to 114° to reduce risk of impingement and further dislocation3
  • Pre-assembled constraining ring to maximise lever-out force of the head and allow for easy assembly insitu1-2
  • Multiple liner configurations to meet the demands of chronic dislocators1
  • Clinically proven locking mechanism2,4,5 used with G7 and RingLoc® Acetabular Systems

The first-generation of constrained liners relied almost exclusively on a metal constraining ring to provide stability and prevent dislocation. Zimmer Biomet’s Freedom Constrained Liner System takes this design 2 steps further to a new level of tri-mode stabilisation:

1. Modular Head Equatorial Flats

Circumferential flats along the head permit easier reduction and provide an extremely strong construct that actively counters the distractive forces that can lead to hip dislocation.

2. Titanium Constraint Ring

The traditional titanium constraint ring supplements the liner’s inherent stability by increasing resistance to lever-out under high demand conditions.

3. Hydraulic Stabilisation

Tightly controlled manufacturing tolerances recreate a natural fluid membrane between the head and liner, resulting in a “suction effect” that further minimises the possibility of dislocation.1

 

 

Product Feature References:

  1. Berend, K,, et al. A Constrained Device with Increased Range of Motion Prevents Early Dislocation.Clinical Orthopedics and Related Research. 447: 705, 2006. 
  2. Tradonsky, Set al. Performance Characteristics of Twopiece Acetabular Cups Series II. Scientific Exhibit. 62nd Annual AAOS Meeting. 1996. 
  3. Data on file at Biomet. Bench test results not necessarily indicative of clinical performance. 
  4. Fehring,T. et al. Motion at the Modular Acetabular Interface: A Competitive Study. Scientific Exhibit. 62nd Annual AAOS Meeting.1996. 
  5. The Danish Hip Arthroplasty Register, 2011 Annual Report, confirms 15-year survivorship at 98.1% for the Ranawat-Burstein RingLoc cup design.

Technology

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References

  1. Berend, K. et al. A Constrained Device with Increased Range of Motion Prevents Early Dislocation. Clinical Orthopedics and Related Research. 447: 705, 2006.
  2. Tradonsky, S. et al. Performance Characteristics of Twopiece Acetabular Cups Series II. Scientific Exhibit. 62nd Annual AAOS Meeting. 1996.
  3. Data on file at Biomet. Bench test results not necessarily indicative of clinical performance.
  4. Fehring,T. et al. Motion at the Modular Acetabular Interface: A Competitive Study. Scientific Exhibit. 62nd Annual AAOS Meeting.1996.
  5. The Danish Hip Arthroplasty Register, 2011 Annual Report, confirms 15-year survivorship at 98.1% for the Ranawat-Burstein RingLoc cup design.

 

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