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Stryker MITCH TRH Primary Acetabular Hip
Systems
Not available in the US
and not FDA Approved
Original Link Click Here
The MITCH TRH™ System is a total hip femoral head
resurfacing system manufactured by Finsbury exclusively
for Stryker®.
Bearing
The MITCH TRH™ bearing is a high precision ‘as
cast’ high carbon cobalt chrome bearing based on over
ten years of clinical experience. Advances in
manufacturing technology means that the tolerances are
able to be more tightly controlled than with older
products
Manufacturing
The MITCH TRH™ implants are manufactured by
Finsbury Orthopaedics. Finsbury is one of the most
experienced manufacturer of metal on metal hip
resurfacing components. The combination of Finsbury
Orthopaedic’s experience in hip resurfacing and
Stryker’s proven track record of fixation developments
have led to the production of the latest generation
resurfacing system: MITCH TRH™ Cementing Technique The
MITCH TRH™ Resurfacing head is designed to have a thin,
continuous cement mantle around the head to give
complete fixation. Too thick a cement mantle can lead to
oversizing of the acetabulum, too thin a mantle and it
can become discontinuous and reduce load transfer. The
MITCH TRH™ resurfacing head therefore has an internal 2°
conical taper and uses a low viscosity cementing
technique.
MITCH TRH Resurfacing Design
Designed to reduce distal loading and improve
epiphyseal fixation and thereby potentially reduce the
incidence of neck thinning which is being seen
clinically with contemporary designs with longer,
thicker stems
Acetabular Fixation
The MITCH TRH™ Cup has a plasma sprayed rough titanium
layer and then a plasma sprayed hydroxylapatite coating.
These are low temperature processes which do not affect
the metallurgy. This combination of materials has also
been thoroughly tested to ensure there is no corrosion
potential. The combination of titanium and HA as a bone
ingrowth surface is ideal as titanium is more
biocompatible than cobalt chrome and HA promotes faster
bone on-growth.
In contrast to older designs however, the MITCH TRH™
cup features a variable offset bore which increases the
amount of head coverage in the smaller sizes in
particular and therefore reduces the chance of rim
loading and elevated wear.
Implant Options
The MITCH TRH™ system is fully colour coded to improve
ease of use and comprises 11 sizes of acetabular
component from 44mm to 64mm in 2 mm increments. Each cup
has a dedicated resurfacing head. The MITCH TRH™ system
also features V40™ Modular heads which are available in
4 offsets.
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