Page 13 - KNEETA

Condylar Geometry
Designed to restore natural kinematics.
The KNEETA® coronal and sagittal radii for each of the medial pivot and lateral femoral condyles produces two partial spheres. The spherical medial pivot femoral condyle
pivots about the matching spherical depression on the tibial insert, while 15° of rotation around the medial-pivot point is allowed with an arcuate path on the
lateral articular surface. This “ball-in-socket” medial-pivot mechanism maximizes medial pivot congruency while providing controlled A-P translation on the lateral
articular surface.

KNEETA Pivot Total
paradoxical motion demonstrated in traditional total knees. 12

Cross Section Through the Lateral Condyle:
Less Constrained Than Medial pivot Side

Rotation Lateral compartment
Around Medial pivot Condyle
allows for rotation
around medial pivot

Medial pivot compartment
allows for anterior-
posterior stability,
replacement of ACL
Coronal and sagittal radii are equal and PCL
on the femoral component.
The coronal radius is matched
in the polyethylene insert.
Cross Section Through the Medial pivot Condyle:
“Ball-in-Socket” Congruency

Bone Conservation 0,8 Medial-Pivot

Standard PS
0,7
KNEETA Pivot 0,6
Total insert is more bone conserving than traditional posterior stabilized
knees which requires resection of the femoral bone for the spine/cam 0,5
mechanism engagement. 13 0,4
0,3
0,2
0,1
0
Volume/Cubed Inches

Instead of a traditional spine/cam mechanism, the insert features an
anterior lip which provides a vertical jumping distance of 11mm for all
sizes. The horizontal jumping distance for this lip is size dependent, and
varies between 23mm-32mm. KNEETA® Medial-Pivot Total
vertical jumping distance is
11 mm. Horizontal jumping
distance ranges from 23 mm
to 32 mm (size dependent).

11 mm

23 mm-32 mm
SUNTEK KNEETA R
Medical Devices
and Electronic Total Knee system
Products Trade Co. KNEETA® Medial-Pivot Knee System
13