Page 17 - KNEETA

pivot This medical pivot meniscal “socket” is what provides the KNEETA®
larger than the lateral collateral ligament (LCL) and remains taut Medial-Pivot Total Knee System its stability. There are however other
throughout the range of motion. The LCL, in the normal knee, features that contribute to the high conformity of this design. The
medial pivot anterior lip acts to replace the PCL and minimize anterior
initiates. FIGURE 1
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to stop posterior slide. FIGURE 3

PCL stops Medial pivot posterior lip
anterior slide replaces ACL and
stops posterior slide

Lateral meniscal
path allows for 15°
of motion
Medial pivot meniscal
Medial pivot anterior lip replaces “socket” provides
PCL and stops anterior slide stability
FIGURE 3 | KNEETA® Medial-Pivot Total Knee System “socket” features
Lateral meniscus
allows motion Medial pivot meniscus
and concave surface
provide stability
ACL stops When coupled with the “socket” of the tibial insert implant,
posterior slide this “ball-in-socket” ensures medial pivot compartment
FIGURE 1 | Anatomic structures of the normal knee stability throughout the range of motion, just like the
normal knee. The more open lateral compartment
allows more motion on the lateral side, just like the
normal knee. 11
and most are dissected. In order to restore function of the normal
In vivo kinematics studies assessed clinically successful
This is the fundamental mantra of the “ball-in-socket” philosophy. total knee arthroplasties comparing the KNEETA®
While all conventional TKA replacements attempt to alleviate pain, Medial-Pivot Total to traditional posterior cruciate retaining
not all restore the function of the normal knee. The KNEETA® designs. The kinematics of the knee motion, analysed
Medial-Pivot Total Knee System aims to replicate the function of during the stance phase of gait, proved that the medial-
the normal knee by creating a “stable” medial pivot compartment pivot knee had a medial-pivot motion, just like the
and permitting a mobile lateral compartment. normal knee, while posterior cruciate retaining designs
had paradoxical roll forward of the tibia on the femur. 11
The “ball” portion of the “ball-in-socket” philosophy centers on the
spherical condyles of the distal femoral component. The condyles While the general goal for knee replacement surgery is to relieve
of the KNEETA® Medial-Pivot Total Knee System femoral implant pain and restore function, patient expectations have increased.
have Long-term clinical history has illustrated that knee systems
FIGURE 2 12
However, these systems are now deemed antiquated, as the latest
research is beginning to yield the mechanisms behind maximizing

survivorship, but patient demand has been the key factor in driving

implants by making the posterior condyles thicker. By doing so,
this relieves the articular geometry in the posterior compartment

its conventional alternative. 13,14
FIGURE 2 | KNEETA® Medial-Pivot Total Knee System “ball” feature implants have similar clinical observations, citing maximum active
15 Several studies have

14-16 FIGURES 5 & 6
SUNTEK KNEETA R
Medical Devices
and Electronic
Products Trade Co. KNEETA® Medial-Pivot Knee System Total Knee system
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