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Zimmer, Inc.

Innex® Total Knee System

Product Description

The introduction of the Innex system (Innex stands for “Innovation Nexus Next Generation”) in 2001 was an important step in the understanding of the demanding solutions connected with the endoprosthetic treatment of degenerative diseases of the knee joint. 

The System represents the mobile bearing platform and also offers a fixed and revision option. The posterior cruciate ligament can be preserved in the CR version or resected in the CS version of the system.Therefore the articular surface component exists as congruent and ultracongruent design.

Re-establishment of the natural anatomical relationships between the femur, tibia and patella, together with physiological axis alignment, is a decisive factor if patients are to be treated successfully with predictable and reproducible results.

The cementless fixation of the Innex Total Knee System is ensured with the Cancellous Structure Titanium™ (CSTi™) porous coating which has more than 25 years of experience.

The aim of the Innex System is to cover as many indications as possible in the field of total knee endoprosthetics, such as osteoarthritis with diverse degrees of varus/ valgus deformities.  This is possible with a minimum of components with the choice between mobile or fixed bearing.  The Innex Total Knee System is based on a simple and modular surgical technique.   This means that the instrument set can be kept compact and limited in range. The surgeon can decide the right therapeutic solution for the patient at each step of the surgical technique.

Anatomically shaped implants, coupled with the logical and precise instrument set, enable treatment of degenerative diseases with bone-sparing resections as well as extensive restoration of the natural kinematics of the knee joint.

The Innex ® Total Knee System is not available for sale in the USA.

References

Author(s)

N (analyzed)

Knee system

Fixation

time point
[years]

Survival rate
(all reasons)

Survival rate
(aseptic loosening)

Local complications
leading to revision

(as a fraction of N)

Munzinger et al., 2009(20(1))

411 (260)

Innex UCOR

mostly cemented

5

95.6%

100%

Total revision:
0.7% infection
0.2% overstuffing
Partial revision:
1.5% instability
0.2% arthrofibrosis
0.2% anterior knee pain

Hochgatterer et al., 2009(2)

246

Innex UCOR
Innex FIXUC

cemented

8

96.1%

96.5%

1.6% aseptic loosening
0.8% infection

Hauk et al., 2009(3)

30 (27)

Innex FIXUC

cemented

2.1

93.1%

96.7%

3.3% aseptic loosening
3.3% flexion contracture

Guggi et al., 2008(4)

2734 (396)

Innex UCOR

mostly cemented

5

96.5%

100%

1.1% infections
1% anterior knee pain
0.6% instability
0.8% other

Böhler et al., 2010(5)

122 (120)

Innex UCOR
Innex FIXUC

cemented

2

97.5%

99.2%

0.8% aseptic loosening
0.8% infection
0.8% arthrofibrosis

 

  1. Munzinger, U. K., Maffiuletti, N. A., Guggi, T., Bizzini, M., Preiss, S., and Drobny, T.: Five-year results of the Innex total knee arthroplasty system. Int Orthop. 2009.
  2. Hochgatterer, R and Boehler, N. TKA with fixed or mobile bearings in the same system: Long-term results with special consideration to the patella. EFORT.Vienna . 2009.
    Ref Type: Conference Proceeding
  3. Hauk, C., Heyse, T. J., Witteborn, M. C., Schofer, M. D., Fuchs-Winkelmann, S., and Schmitt, J.: [Matched pair analysis: Innex FIXUC vs. NexGen LPS]. Z Orthop Unfall. 147:183-187, 2009.
  4. Guggi, T, Preiss, S, Sussmann, P, Vonknock, F, Drobny, T, and Munzinger, U. Five-years results of the Innex UCOR total knee arthroplasty. EFORT.Florence . 2008.
    Ref Type: Conference Proceeding
  5. Böhler, N., Halder, A., Köhler-Korkor, S., and Hinz, M. Innex 2-year results of a study randomized by type of bearing and patella resurfacing.  2010.
    Ref Type: Unpublished Work

Technology

 

Gender Solutions®

MIS instruments

Indications: The Innex® Total Knee System is a cruciate retaining (CR) and cruciate resecting (CS) system with mobile and fixed bearing, in cemented and uncemented version. With congruent and ultracongruent option, indicated in non inflammatory degenerative joint disease, e.g., vascular necrosis, osteoarthritis, and arthritis secondary to a variety of diseases and anomalies, failed previous surgery where pain, deformity, or dysfunction persist.

Contraindications: Patient’s physical conditions that would eliminate or tend to eliminate adequate implant support or prevent the use of an appropriately sized implant, e.g., previous surgery, insufficient quality or quantity of bone resulting from conditions such as cancer or congenital dislocation, osteoporosis, osteomyelitis, neuromuscular compromise or vascular deficiency in the affected  limb in sufficient degree to render the procedure unjustifiable (e.g., absence of musculoligamentous supporting structures, joint neuropathy) or other conditions that may lead to inadequate skeletal fixation.

For additional information about Indications and contraindications, please refere to the instructions for use leaflet of the product, reference D011 500 239.