Stryker Howmedica Orthopaedics
http://www.stryker.com/orthopaedics/medprof/kneehome.php
MAHWAH CAMPUS
Stryker Orthopaedics
325 Corporate Drive
Mahwah, New Jersey 07430
(201) 831-5000
Stryker Total Knee Replacement Systems
Stryker is one of the largest developers and manufacturers of total
knee replacement systems in the world. The company designs and
develops versatile knee systems such as the Scorpio® Knee and
Duracon® Total Knee Systems, which offer improved range of
motion and provide greater flexibility in the performance of daily
activities. Another innovation is the EIUS™ Unicondylar Knee
System, a minimally invasive system designed to offer the surgeon
an instrumented system requiring minimal bone resection.
Stryker is dedicated to the introduction and marketing of knee
implant and instrument products that are based on scientific
solutions to real-life clinical problems. The MRS™ System, which
was the first of its kind, is used in treating oncology, revision, and
trauma patients with severe bone loss and soft-tissue instability.
Along with the Modular Rotating Hinge (MRH) Knee, these systems
offer complete intra-operative flexibility, which allows the surgeon to
match the implant to the patient's needs.
Duracon® Total Knee System
The Right Track-The Duracon Total Knee System provides an innovative design with substantiated clinical
success. A decade of unparalleled wordwide clinical success with over 500,000 cases has established the
Duracon Knee as a standard in Total Knee Arthroplasty.
The Duracon Knee System provides solutions for the demands of today's Total Knee Arthroplasty. Cruciate
Retaining, Posterior Stabilized, Revision Total Stabilizer, Modular Rotating Hinge and the Modular
Replacement System address challenges in the OR.
Clinical success includes large teaching institutions, community hospitals, single and multi-centers,
individual surgeons and surgeon groups throughout the world.
The Duracon Knee System represents proven design philosophies that offer solutions to put total knee
arthroplasty on the right track.
Medical Professionals > Knee Systems > Duracon® Total Knee
Duracon® Total Knee System
Excellent Articular Conformity
Improved Wear Characteristics The Duracon System provides superb articular conformity throughout the
range of motion, reducing contact stresses generally associated
with wear.
The Duracon Femoral Component features radiused distal
condyles which enhance conformity to the radii of the tibial
insert, increasing the surface contact area and reducing contact
stresses. Concave intercondylar radii further reduce point
contact stresses, allowing additional congruity throughout
rotation. Elongated posterior condyles cover resected bone and
extend the contact between the condyles and the polyethylene
insert, reducing the potential for bone/polyethylene abrasion
and third-body particular wear debris.
The Duracon Tibial inserts have radiused A/P and M/L dishes
produced by advanced 4-axis machining, maximizing
conformity of the tibial insert to the radiused condyles of the
femoral component. The resulting rotary arc is unique to the
Duracon System, and accommodates the knee's natural screw-home mechanism while allowing the femoral
component to rotate freely. Duracon Tibial Inserts also feature a generous polyethylene thickness, reducing
the potential of maximum contact stresses exceeding the yield strength of polyethylene. Duracon inserts are
available in Condylar, A/P Lipped, Stabilizer and Total Stabilizer styles, each offering a high degree of
conformity and various constraints. All Duracon inserts are manufactured of Duration® Stabilized UHMWPE.
The Condylar insert is the least constraining of the four styles. The A/P Lipped Insert provides anterior /
posterior stability of a post design without the need for invasive femoral resection. It features an anterior
build-up to increase conformity to resist anterior femoral subluxation. The Stabilizer Insert is primarily a
posterior cruciate ligament substitute, while providing secondary collateral and medial / lateral translational
stability. The Total Stabilizer insert is ideal for revision cases, providing exceptional stability when the
collateral ligaments may be compromised.
All of the Duracon Patellar designs feature identical articulating geometries with medial/lateral facets that are
designed to conform to convex intercondylar radii of the femoral component, providing optimum conformity
and stability. Similar to the Duration inserts, all Duracon patellae are manufactured of Duration® Stabilized
UHMWPE.
Duracon® Total Knee System
Exceptional Anatomic Patellofemoral Tracking
Reduced Articular Stresses and Fewer Potential Patellar Problems. The Duracon System provides
balanced, stable anatomic tracking and normalized quadriceps and patellar tendon tension. This reduces
excessive stresses and may lead to fewer soft tissue adjustments.
The Duracon Femoral Component features an anatomic lateral
flare and smooth lateral rise that enable the patella to follow a
natural lateral path during extension. Beyond 110° of flexion, the
patella is supported by an elongated trochlear groove. This deep,
conforming groove, combined with proper tibiofemoral alignment
and rotary arc, minimize patellar stresses that may lead to
accelerated wear and other patellar problems such as subluxion,
deformation, and fracture, while allowing for maximum range of
motion.
The Duracon patellar components, available in three styles,
feature medial/lateral facets that are designed to conform to the
convex intercondylar radii of the femoral component, allowing the
patella to ride low in the patellofemoral groove. The asymmetric
patella is a resurfacing component. It features a generous
polyethylene thickness, and has a larger lateral facet for greater
bone coverage. Available in all-plastic and metal-backed styles,
the asymmetrical patella naturally medializes the component
placement. The all-plastic symmetric patella, which may be used
as a resurfacing or inset patella, allows surgeon preference to
dictate patellar orientation. Its thinner design addresses smaller
patient anatomies. The inset patella is a unique bone-sparing, allplastic design with undercuts and slots that eliminate the need for
a large central lug or pegs.
Traditional multiple axis knee designs provide
excellent ligament stability at 0° and 90° of flexion.
However, when the radius changes at 30° to 45° of
flexion, knee geometry also changes. This causes a
reduction in ligament isometry which can lead to
mid-flexion instability. Patients are less confident
and less capable of performing simple daily tasks
which require mid-flexion stability, such as rising
from a chair, ascending or descending stairs or an
incline, and changing from the gas pedal to the
brake pedal while driving.
The Scorpio® Knee's single axis, single radius design
provides for a constant rotational geometry
throughout the functional range of motion. This
allows for a smooth transition from flexion to
extension while preserving collateral ligament
isometry. Stability is maintained at 0° and 90° of
flexion and at every flexion angle in between, which
can lead to better patient confidence and ability.1
SCORPIO® CR KNEE IS DESIGNED TO ADDRESS:
NORMAL KNEE KINEMATICS
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Single A/P radius designed to closely reproduce
natural knee kinematics.
Single axis of rotation is designed to provide
even tensioning of the PCL and collateral
ligaments.
Anterior sulcus position is designed to
"counterbalance" the remaining anatomic
ligament structures.
RANGE OF MOTION (ROM)
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[click on picture to enlarge]
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CRUCIATE RETAINING KNEES PRESENT
SPECIFIC CHALLENGES TO THE
ORTHOPAEDIC SURGEON WHICH INCLUDE:
Design provides increased and reproducible
range of motion.
Deepened patella groove designed to ease tension
across extensor mechanism to facilitate deeper
flexion.
4° posterior slope in tibial insert allows for deep
flexion.
Built-in ±15° internal/external rotation allows for
variation in patient anatomy and intraoperative
flexibility.
POLYETHYLENE WEAR

Recreating normal knee kinematics

Unpredictable range of motion
(ROM)

Polyethylene wear
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Conforms in both the M/L and A/P planes,
maximizing contact area, potentially reducing
polyethylene wear.
Single M/L radius maximized femorotibial
contact area by providing 1:1 conformity in the
M/L plane.
Single A/P radius provides for consistent
collateral and PCL tension which can reduce the
potential for posterior and asymmetric wear.
SCORPIO® PS KNEE IS DESIGNED TO ADDRESS:
PATELLO-FEMORAL ARTICULATION
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Single A/P radius allows for normal recreation of
natural knee kinematics
Single A/P radius designed to improve extensor
mechanism function and reduce patello-femoral
joint reaction force.
Deepened patello-femoral groove designed to
reestablish the anatomical surface and to provide
for smooth patella tracking through a full range
of motion.
IMPLANT CONFORMITY

[click on picture to enlarge]
POSTERIOR STABILIZING KNEES PRESENT
SPECIFIC CHALLENGES TO THE
ORTHOPAEDIC SURGEON WHICH INCLUDE:

Patello-femoral Articulation

Implant Conformity

Bone Conservation

Conforms to both
M/L and A/P
planes,
maximizing
contact area,
potentially
reducing
polyethylene
wear.
Single M/L radius
maximizes
femoro-tibial
contact area by
providing 1:1
conformity in the
M/L plane.
BONE CONSERVATION

Scorpio® PS femoral
component is up to two times
less invasive compared to
other implants.
The Scorpio® Knee's unique cam-eminence
mechanism requires the smallest intercondylar
width and volume of bone removed as compared
to competitive designs.