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GEMINI SL Total Knee Replacement

  • High degree of joint stability and good kinematics
     
  • High primary stability
     
  • Natural joint reconstruction with physiological freedom of movement and functionality1, 2, 3
     

Successful long-term clinical outcomes4

  • 5 yrs 97.5%
     
  • 10 yrs 95.5%
     
  • Extended range of indications and comprehensive treatment options with intraoperative flexibility

Designs

Numerous different versions enable customization to suit different bone structures and possible sensitivity. The system permits cemented and cementless anchorage. Additional PorEx Surface Modification can reduce ion release, and can also reduce wear because the coefficient of friction is lower.14 Modular tibial components allow approximation of tibial stems, which can ensure stability when bone condition is poor.7

In addition, a SpheroGrip version with monoblock tibial metal casing is available.

Versions

Fixed Bearing as cruciate ligament-conserving (CR) or cruciate ligament replacement (PS) and Mobile Bearing (CR/CS) are available. GEMINI SL Fixed Bearing consists of a single tibial metal casing, which enables both cruciate ligament preservation (CR) and cruciate ligament replacement (PS) options. This simplifies the choice of implant and gives intraoperative flexibility.
 

  • Anatomically adapted tibia
  • Modular, anatomically adapted prosthesis components
  • Wide choice of sizes for every stature, irrespective of gender or ethnicity5
  • Fine size increments enable natural reconstruction of the posterior offset
  • Secure fixation against shear and rotational forces6
  • Numerous treatment options for a wide range of patients and indications plus greater intraoperative flexibility
  • Developed for reconstructing natural kinematics with high flexion and successful long-term function

Features of GEMINI® SL® Fixed Bearing PS:

  • Post-cam attachment comparable to the natural knee13
  • Uniformly large contact surface on the pin
  • Low surface load on the pin13
  • Reliable and secure coupling mechanism13
  • Minimal luxation risk13.
  • Enlarged contact surface during flexion with reduced contact load and minimal fracture risk and abrasion.13

If the ligaments and capsule are intact and joint stability is good, the Fixed Bearing Cruciate Retaining (CR) version can be used for natural joint reconstruction.

The Fixed Bearing CR with moderate congruence reduces the bone loading by means of enhanced load distribution, and enables natural femoral rollback and femur rotation15.

If the posterior cruciate ligament is insufficient or has been removed,
the Fixed Bearing Posterior Stabilized (PS) version is used.

The freedom of rotation provided by GEMINI SL Mobile Bearing helps to preserve the alignment of the patellofemoral and also femorotibial articulations during knee flexion. Self-alignment by means of rotation of the polyethylene PE articulating surfaces improves the postoperative kinematics.11

At the same time, the polished tibial base plate improves the abrasion behavior.10, 11

GEMINI SL Mobile Bearing offers the advantage of a highly compliant joint geometry with reduced surface and substrate stress distribution, while the Mobile Bearing articulation reduces the development of boundary surface bone loads.9
Good mobility with an enlarged articulation surface.
The high degree of articulation congruence stabilizes the knee, also in cases of loss of the posterior cruciate ligament.8, 9, 12
 

At the same time, the polished tibial base plate improves the abrasion behavior.10, 11

Secure plateau fixation
The unique dovetail guidance largely eliminates any risk of luxation of the plateau.

The concept of the Mobile Bearing allows significant enlargement of the contact surface, and therefore a reduction in contact loading8, 9 and permits a high articulation congruence with free rotation, thus improving the kinematics.10

In the production of Vit-E plateaus, vitamin E is used as an antioxidant in order to protect the material by neutralizing the free radicals created by highly crosslinking. The product's mechanical proper­ties and biocompatibility are preserved 19,20,21,22,23

 

Highly Cross-Linked by irradiation 

  • Improved wear resistance for delamination as well as abrasion – Reduction up to 94%16,17 

 

Vitamin-E-Doped

  • Stabilizing of UHMWPE by enrichment with Vitamin E respectively synthetic available product alpha-tocopherol.
    Reduction of free radicals improves durability. Embrittlement decreases18

  • X-Linkining increases the wear resistance
     
  • Thanks to the absence of heat treatments all benefits of the irradiation are saved (fatigue, strength) and there is no mechanical characteristics decrease (fatigue, elongation, toughness).
     
  • Vitamin E has antibacterial features.

Visit our spar-k microsite for information about the new spar-k instrument set:

spark.linkorthopaedics.com

LINK PERSEUS - GEMINI SL

GEMINI SL - ODEP Flyer

Name: 737_GEMINI_SL_Flyer_ODEP_rating_EN_2024-07_004.pdf
Size: 2 MB

GEMINI SL - Teaserflyer

Name: 737_GEMINI_SL_Teaser_en_2020-11_002.pdf
Size: 4 MB

GEMINI SL - Flyer

Name: 737_GEMINI_SL_Flyer_en_2018-03_003.pdf
Size: 10 MB

GEMINI SL - OP, Impl. Instr.

Name: 737_GEMINI_SL_OP_Impl_Instr_en_2021-03_001.pdf
Size: 5 MB

GEMINI SL E-DUR

Name: 737_GEMINI_SL_E-DUR_Suppl_en_2022-08_002.pdf
Size: 1 MB

GEMINI SL with SPAR-K - Surgical Technique

Name: 748_GEMINI_SL_SPAR-K_OP_Impl_Instr_en_2020-12_003.pdf
Size: 6 MB

spar-k - Teaserflyer

Name: 748_SPAR-K_Teaserflyer_en_2020-03_003.pdf
Size: 737 KB

GEMINI SL - MIT-K Instruments

Name: 732_MIT-K_Instr_en_2021-09_004.pdf
Size: 3 MB

GEMINI SL - MIT-K Surgical Technique

Name: 732_MIT-K_OP_en_2021-09_006.pdf
Size: 4 MB

GEMINI SL EXTRABONE

Name: 731_Extrabone_Flyer_en_2021-10_002.pdf
Size: 960 KB

GEMINI SL - Literature Research

Name: 737_GEMINI_SL_Literature_en_2022-02_001.pdf
Size: 2 MB
  1. H. Thabe, „Auswirkungen verschiedener konstruktiver Prothesenmerkmale auf Langzeitergebnisse“, Akt Rheumatol 2013;38.
  2. Internal data - H. Thabe, „Aspekte zum Konzept der beweglichen Tibiaplateaukonstruktion, April 2000.
  3. J. Goodfellow, “The Mechanics of the Knee and Prosthesis Design”. J Bone Joint Surg Br 1978; 60:358-369
  4. ripo.cineca.it/pdf/relazione_2016_v19_inglese.pdf
  5. Internal data - H. Thabe, “ Arthroprometic sizing in TKA / GEMINI MK2”
  6. P.S. Walker, “A Comparative Study of Uncemented Tibial Components”. J Arthroplasty 1990; 5:245-253
  7. A. Completo et al., “The influence of different tibial stem designs in load sharing and stability at the cement-bone interface in revision TKA”. Knee 2008;15:227-232
  8. S. Bignozzi, “Three different cruciate-sacrificing TKA designs: minor intraoperative kinematic differences and negligible clinical differences”. Knee Surg Sports Traumatol Arthrosc 2014; 22:3113-3120
  9. B. Innocenti, GEMINI SL Mobile Bearing / Fixed Bearing CR Biomechanical analysis in healthy and deficient PCL patient LINK 999_WP_003_2017_Gemini-SL_en, 2017
  10. J. Callaghan, “Mobile-Bearing Knee Replacement: Concept and Results”. AAOS Instructional Course Lectures 2001; 50:431-449
  11. D. Dennis, “Mobile Bearing Total Knee Arthroplasty Design Factors in Minimizing Wear”. Clin Orthop Relat Res. 2006; 452:70-77
  12. Internal data - S. Greenwald, “Classification of Mobile Bearing Knee Design: Mobility and Constraint”, 2002
  13. B. Innocenti, GEMINI SL Fixed Bearing PS: Biomechanical Analysis of the Post-Cam System. LINK 999_WP_002_2017_Gemini-SL_en, 2019
  14. Internal technical report: Study of the influence of TiNbN-coating on the ion release of CrCrMo-alloys in SBF buffer simulator testing.
  15. GR Scuderi, WN Scott, “Total Knee Arthroplasty. What we have learned.”1996; Am J Knee Surg 9:73-75
  16. S. M. Kurtz, „The Origins and Adaptations of UHMWPE for Knee Replacement“, in UHMWPE Biomaterials Handbook, S. M. Kurtz, Ed., Burlington, MA Academic Press 2009.
  17. S. M. Kurtz, „Advances in the Processing, Sterilization, and Crosslinking of Ultra-high Molecular Weight Polyethylene for Total Joint Arthroplasty“, Biomaterials 1999; 20:1659-1687.
  18. E. M. Brach del Prever, „UHMWPE for Arthroplasty: Past or Future?“, J Orthopaed Traumatol 2009; 10:1-8
  19. Produktakte W. LINK (Quadrant, MediTECH Data Sheet)
  20. E. Oral, „Characterization of Irradiated Blends of Alpha-tocopherol and UHMWPE“, Biomaterials 2005; 26(33):6657-6663.
  21. E. Oral, „Highly Crosslinked UHMWPE Doped with Vitamin E“, in UHMWPE Biomaterials Handbook, S. M. Kurtz, Ed., Burlington, MA Academic Press 2009.
  22. S. M. Kurtz, „Vitamin-E-Blended UHMWPE Biomaterials“, in UHMWPE Biomaterials Handbook, S. M. Kurtz, Ed., Burlington, MA Academic Press 2009.
  23. S. M. Kurtz, „Trace Concentration of Vitamin E Protect Radiation Crosslinked UHMWPE from Oxidative Degradation“, J Biomed Mater Res A 2008; 549-563
  24. B. Innocenti, Biomechanical analysis of GEMINI SL total knee replacement implant designs up to 155° of flexion. LINK 999_WP_001_2017_Gemini-SL_en, 2019

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