Rotating Platform KneesFunction with Wear Resistance

Today’s diverse patient population demands a

knee system that can react to the needs of the

individual patient. The SIGMA Knee System is

designed to bring together function with wear

resistance to match patient needs.

Regardless of the size, shape or activity level

of patients, surgeons can feel confident

that with the SIGMA Knee system, they can

choose the procedure and implant to meet

their patients’ demands.

SIGMA® Knee System

The SIGMA Knee System offers one of today’s most comprehensive, integrated knee systems.

It embraces a wide variety of philosophies and surgical techniques with the addition of further

implant options and instrumentation.

The SIGMA Rotating Platform Knee Portfolio

1- Post (Round & Oval)

3-Post (Round and Oval)

Inset

Curved (CVD) RPFStabilized (STB)

CR CR150 PS PS with lugs RP-F Open Box PSCR Porocoat®

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MBT Cementless Cone MBT Cemented Cone MBT Cementless Keel MBT Cemented Keel

SIGMA Rotating Platform KneesFunction with Wear Resistance

Femoral Components

Rounded coronal geometry maximizes contact area while minimizing contact stresses1

Accommodates high flexion with SIGMA 150 and RP-F Knees.

Highly Polished Cobalt Chrome Tibial Tray

Minimizes abrasion and is designed to reduce backside wear2

Based on the clinical heritage of the LCS™ Total Knee System

Unidirectional Motion

Conforming design promotes insert rotation relative to tibial tray

Self aligning bearing is designed to decouple flexion extension and rotation into

two unidirectional motions

Diminishes incidence of tray loosening by reducing torque stress at the proximal tibia4

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The SIGMA Femoral Components are designed to provide enhanced function for high

demand patients. The main benefits of the femoral components are:

Rounded Coronal Geometry

By utilizing a round-on-round geometry, the system allows a larger contact area and lower contact stresses, both

in neutral alignment and varus or valgus lift-off compared to flat-on-flat designs. This optimizes the trade-off

between maximal contact area and constraint of the implant.1

In contrast, lift-off of the femoral component in a flatter condylar design can lead to edge loading on the

opposite side. This may cause high concentrations of contact stresses on the polyethylene.

High Flexion

Today’s patients want a knee that provides both function and stability during high flexion. SIGMA Knees offer

high flex designs to accomodate the different philosophies of PCL management and the wear reducing benefit of

rotating platform.

The SIGMA Knee’s specific J-curve gives enhanced implant-to-bone contact through 150 degrees of flexion,

potentially reducing the risk of point contact stress.

Optimal Function

Edge Loading

DePuy Synthes established leadership in implant design with the introduction of rotating

platform knees in the United States. This mobile bearing design now has over 30 years clinical

success.

Wear ResistanceHighly Polished Cobalt Chrome Tray

Unidirectional Motion

The design of the rotating platform MBT tray plays

pivotal role in separating complex, multidirectional

motions inherent in fixed bearing designs. The motion

can be separated into two categories:

• Topside motion flexion / extension

• Backside motion internal / external rotation

Topside motion: The congruent, articulating surface of

the rotating platform design maximizes contact area

while diffusing shear and torsional forces which may

lead to implant loosening.

Backside motion: The decoupling of stresses minimizes

constraint forces placed on the bone implant interface

to improve implant fixation that may assist in the

long term survivorship of the implant as evidenced by

97.7% survivorship at 20 years.3

Multidirectional Unidirectional

Principle Transverse

Proven Design

The MBT Tray builds upon clinical experience gained

with the DePuy Synthes rotating platform design. Its

long term success, 97.7% survivorship at 20 years

for mechanical reasons or poor clinical knee score,

demonstrates that bearing rotation can effectively

reduce wear and loosening forces.3

Highly Polished Surface

The polyethylene friendly, highly polished CoCr tray

creates a smooth surface, minimizing abrasion.2

The highly polished top surface of the MBT tray allows

the insert to articulate smoothly and provides improved

low wear performance.5

Size 6**

Size 5

Size 4

Size 3/4N

Size 2.5

Size 2

Size 1.5

Technical Details

**Not Available for TC3 Femoral Components

*10 mm for size 6

8 mm

9 mm*

Sagittal Shape

Coronal Shape

17.8 mm Inner Box (Dimension Constant)

Box height of SIGMA PS Femoral Components

Size 1.5 14.0 mm

Size 2 14.8 mm

Size 2.5 14.8 mm

Size 3 14.8 mm

Size 4 16.7 mm

Size 4N 16.7 mm

Size 5 18.6 mm

Size 6 19.5 mm

M.B.T. Info

Size Keel Height M/L Keel

1.5 38 mm 37 mm

2 38 mm 37 mm

2.5 38 mm 37 mm

3 38 mm 37 mm

4 43 mm 43 mm

5 43 mm 43 mm

6 48 mm 49 mm

Curved Insert

10, 12.5, 15, 17.5(mm)

Posterior Stabilized (PS) Insert

10, 12.5, 15, 17.5, 20, 22.5, 25 (mm)

RP-F Insert

10, 12.5, 15, 17.5 (mm)

M.B.T. Tray Sizing

SizeM/L

(mm)A/P

(mm)

Stem Length (mm)

1 59.2 39.0 28.8

1.5 61.8 40.7 28.8

2 64.6 42.6 33.5

2.5 67.1 44.2 33.5

3 69.6 45.8 33.5

4 74.9 49.3 39.0

5 80.6 53.1 39.0

6 86.8 57.2 39.0

7 91.8 60.4 39.0

Anterior View of M.B.T. Tray with Keel

Keel Length is13mm for Sizes1 – 3, and 19mmfor Sizes 4 – 7

Lateral View of M.B.T. Tray with Keel

STEM LENGTH:Sizes 1 & 1.5 = 28.8mmSizes 2, 2.5 & 3 = 33.5mmSizes 4, 5, 6 & 7 = 39.0mm Anti-rotation

Keel swept back25 degrees

Tray Thickness is 4.8mm for all M.B.T. Trays

M.B.T. Tray with Central Stem

Same POROCOAT Porous Coating Thickness is on Entire Bottom

Surface of M.B.T. Trays

POROCOAT Porous Coating Thickness= 0.8mm

POROCOAT™ Porous Coating M.B.T TrayComposite Thickness= 4.8mm Anti rotation tabs

are 1.5mm proudof central stem

SIGMA High Performance Instruments

FunctionHP Instruments are designed to deliver Function with Wear Resistance through ease of use

and improved alignment.Ease of use, or function, impacts all healthcare providers throughout

the surgical pathway including surgeons, scrub techs and surgeon assistants by creating a

straightforward and efficient procedure.

Distal Femoral ResectionEfficient: Engineered for fast pinning and easy removal. Adjustments designed to be easy to access and use.

User-Friendly: Designed for comfortable fingertip control.

Visual Cues: Line-of-site engraved marking for quick, eye-friendly visual clarity. Secure color-coded locking after adjustment.

Fixed ReferenceOptions: Anterior or Posterior referencing in one system, available in 0, 3, 5, or 7 degrees of rotation. Rotation Guides provide reference points to Whiteside’s line and epicondylar axis.

Optimized profile: Cutting blocks are designed to minimize soft tissue impingement, enable complete cuts, and are the same M/L width as the implant.

Flexibility: Allows for downsizing or upsizing changes, as well as last minute +2 or -2mm adjustments.

Wear ResistanceWear resistance is a key factor in an implant’s long-term success. It is influenced by implant

alignment, which is a combination of surgical skill and precise instrumentation.

Tibial ResectionStability: Blocks are designed to maximize stability against the bone, to promote a more accurate cut.

Precision: Instruments provide 1 mm resection adjustment – which allows for optimum gap balancing. Precise calculation sets the exact degree of slope that the surgeon desires based on leg length.

Versatility: Multiple alignment checks/tools are available to aid in correct placement and resection.

Tibial PreparationPrecision: 1 mm cement mantle produced by instruments provides consistent implant fit.

Accuracy: Tray tower is designed for drill and punch to occur at the same spot on the tibia.

Rotation: Rotating Platform instruments allow surgeons to locate optimal implant positioning for rotation.

TRUMATCH® Personalized SolutionsTRUMATCH® Personalized Solutions bring a high

level of personalized total knee replacement

surgery to the operating room, allowing the

surgeon to work with cutting guides individually

prepared to match the alignment criteria and

actual bone surfaces of each patient. This

personalized technology is designed to improve

implant positioning, functionality, and procedure

efficiency through:

• Customized femoral and tibial cutting guides based on mechanical alignment and a CT scan of each patient

• Software that delivers a patient proposal based on each surgeon’s surgical preferences

• Reduction in surgical steps, standard instrumentation, sterilization time, and operating room turnover time

DePuy Orthopaedics, Inc.700 Orthopaedic DriveWarsaw, IN 46582USATel: +1 (800) 366-8143Fax: +1 (574) 267-7196

www.depuysynthes.com

© DePuy Synthes 2016. All rights reserved.DSUS/JRC/0716/1714 12/16

References

1. P.F.C. SIGMA Knee System with Rotating Platform Technical Monograph. DePuy Synthes. Lit. No. 0611-29-050 (Rev.4).

2. McKellop, H., F.W. Shen, B. Lu, P. Campbell and R. Salovey. “Development of an Extremely Wear-Resistant Ultra High Molecular Weight Polyethylene for Total Hip Replacements.” Journal of Orthopaedic Research Vol. 17, No. 2, March 1999: 157-167.

3. Buechel Sr., F.F., F.F. Buechel Jr., M.J. Pappas and M.S. D’Alessio. “Twenty year Evaluation of Meniscal Bearing and Rotating Platform Knee Replacements.” Clinical Orthopaedics and Related Research. Vol. 388, July 2001:41-50.

4. Bottlang, M., Oliver, K.E., Lacatusu, E., Sommers, M.B., Kessler, O. “A Mobile-bearing Knee Prosthesis Can Reduce Strain at the Proximal Tibia.” Clinical Orthopaedics and Related Research No. 447, pp. 105-111.

5. McNulty, D et al. The Effect of Crosslinking UHMWPE on In-vitro Wear Results in fixed and Mobile Beaing Knees. Presented at ASTM Symposium on Crosslinked and Thermally Treated UHMWPE for Joint Replacement, Nov 2002.

DePuy International, Ltd.St Anthony’s RoadLeeds LS11 8DTEnglandTel: +44 (0) 113 270 0461Fax: +44 (0) 113 272 4101