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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®
Fem
oral
Com
pon
ent
Tib
ial
Tra
yP
olye
thyl
ene
Inse
rtP
atel
la
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
Wea
r R
esis
tan
ceF
un
ctio
n
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