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GEMINI SL Total Knee Replacement

Highlights

Fixed Bearing

SPAR-K

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High degree of joint stability and good kinematics
High primary stability
Natural joint reconstruction with physiological freedom of movement and functionality^{1, 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

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

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

Versions

Fixed Bearing as cruciate ligament-conserving (CR) or cruciate ligament replacement (PS) 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.

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

Designs

Additional LINK PorEx (TiNbN) surface modification results in a ceramic-like surface, which significantly reduces chrome and nickel ion release. ¹⁴
Thanks to its outstanding harness, abrasion properties similar to ceramics and a larger wetting angle, in contact with liquids the PorEx surface against UHMWPE has a lower coefficient of friction compared to CoCrMo surfaces.¹⁴

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 abrasion¹³

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 rotation.¹⁵

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

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

spark.linkorthopaedics.com

LINK PERSEUS - GEMINI SL

SPAR-K Teaserflyer

Name: 748_SPAR-K_Teaserflyer_us_2019-06_002.pdf

Size: 564 KB

GEMINI SL Teaser

Name: 737_GEMINI_SL_Teaser_us_2020-11_003.pdf

Size: 4 MB

GEMINI SL SPAR-K

Name: 748_GEMINI_SL_SPAR-K_OP_Impl_Instr_us_2022-01_005.pdf

Size: 5 MB

H. Thabe, „Auswirkungen verschiedener konstruktiver Prothesenmerkmale auf Langzeitergebnisse“, Akt Rheumatol 2013;38.
Internal data - H. Thabe, „Aspekte zum Konzept der beweglichen Tibiaplateaukonstruktion, April 2000.
J. Goodfellow, “The Mechanics of the Knee and Prosthesis Design”. J Bone Joint Surg Br 1978; 60:358-369
ripo.cineca.it/pdf/relazione_2016_v19_inglese.pdf
Internal data - H. Thabe, “ Arthroprometic sizing in TKA / GEMINI MK2”
P.S. Walker, “A Comparative Study of Uncemented Tibial Components”. J Arthroplasty 1990; 5:245-253
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
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
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
J. Callaghan, “Mobile-Bearing Knee Replacement: Concept and Results”. AAOS Instructional Course Lectures 2001; 50:431-449
D. Dennis, “Mobile Bearing Total Knee Arthroplasty Design Factors in Minimizing Wear”. Clin Orthop Relat Res. 2006; 452:70-77
Internal data - S. Greenwald, “Classification of Mobile Bearing Knee Design: Mobility and Constraint”, 2002
B. Innocenti, GEMINI SL Fixed Bearing PS: Biomechanical Analysis of the Post-Cam System. LINK 999_WP_002_2017_Gemini-SL_en, 2019
Internal technical report: Study of the influence of TiNbN-coating on the ion release of CrCrMo-alloys in SBF buffer simulator testing.
GR Scuderi, WN Scott, “Total Knee Arthroplasty. What we have learned.”1996; Am J Knee Surg 9:73-75
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.
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.
E. M. Brach del Prever, „UHMWPE for Arthroplasty: Past or Future?“, J Orthopaed Traumatol 2009; 10:1-8
Produktakte W. LINK (Quadrant, MediTECH Data Sheet)
E. Oral, „Characterization of Irradiated Blends of Alpha-tocopherol and UHMWPE“, Biomaterials 2005; 26(33):6657-6663.
E. Oral, „Highly Crosslinked UHMWPE Doped with Vitamin E“, in UHMWPE Biomaterials Handbook, S. M. Kurtz, Ed., Burlington, MA Academic Press 2009.
S. M. Kurtz, „Vitamin-E-Blended UHMWPE Biomaterials“, in UHMWPE Biomaterials Handbook, S. M. Kurtz, Ed., Burlington, MA Academic Press 2009.
S. M. Kurtz, „Trace Concentration of Vitamin E Protect Radiation Crosslinked UHMWPE from Oxidative Degradation“, J Biomed Mater Res A 2008; 549-563
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