Medical Design Briefs - August 2021 - 18

TECHNOLOGY LEADERS Electrical Connectors/Wires/Cables
Orthopedics/Implants/Prosthetics
Pin
(Tibial Insert/Liner)
Cross-linked polyethylene (XLPE)
Ultra-high-molecular-weight polyethylene
(UHMWPE)
Polyetheretherketone (PEEK)
Disc
(Femoral Knee/Head)
Polyetheretherketone (PEEK)
Cobalt-chrome (CoCr)
Polyetheretherketone (PEEK)
Cobalt-chrome (CoCr)
Cobalt-chrome (CoCr)
Table 1. For tribological properties, MGH used its specifically designed Pin-on-Disc simulator to mimic the forces
and tribological behavior in knees and hips. In these studies, PEEK was used as a tribological partner against
established existing materials.
dard pair CoCr on XLPE - i.e.,
replacing CoCr with PEEK.
* CoCr on PEEK material pair shows
lower wear compared with market standard
pair CoCr on UHMWPE - i.e.,
replacing UHMWPE with PEEK.
Orhun K. Muratoglu, PhD, director
of the Harris Orthopaedics Laboratory
and director of the Technology Im -
plementation Research Center (TIRC)
at MGH and professor of orthopedic
surgery at Harvard Medical School
notes, " At the Harris Orthopaedics
Laboratory, we used our state-of-the art
in vitro wear testing machines to evaluate
the performance of medical-grade
PEEK formulations for orthopedic joint
replacement applications such as hip
and knee implants and found that
UHMWPE-PEEK pair has similar or better
performance than that of the gold
standard UHMWPE-CoCr pair. "
Besides excellent tribological properties
of VESTAKEEP PEEK, the proven
biomaterial for implants provides bonelike
mechanical properties that leads to
reduced stress and therefore reduced
stress shielding. Using a finite element
analysis (FEA), Evonik's polymer
experts have simulated stress shielding
by comparing a femoral knee implant
of PEEK with CoCr. Stress shielding
refers to the reduction in bone density
(osteopenia) as a result of removal of
typical stress from the bone by an
implant (for instance, the femoral component
of a hip or knee prosthesis).
The investigation results demonstrate
the suitability of PEEK in load-bearing
joint parts in addition to the main
research and development focus on tribological
material pairs for joint prothesis
(see Figure 3).
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18
Intro
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Medical Design Briefs, August 2021
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Medical Design Briefs - August 2021

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