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MRI SAFETY INFORMATION:
The ACTIS DUOFIX Hip Prosthesis has not been tested for safety and compatibility in the MR
environment. The devices have not been tested for heating or migration in the MR environment.
Scanning a patient who has this device may result in patient injury.
The risks associated with other passive implants in an MR environment have been evaluated and
are known to include heating, migration, and image artifacts at or near the implant site.
INFORMATION FOR USE
Preoperative
The surgeon should discuss all physical and mental limitations particular to the patient and all
aspects of the surgery and the prostheses with the patient before surgery. The discussion should
include the limitations and possible consequences of joint replacement, and the necessity to
follow the surgeon's instructions postoperatively, particularly in regard to patient activity and
weight.
The preoperative planning and surgical techniques for implantation of these hip replacement
components evolved from the surgical experience gained during the development of many hip
prostheses. Surgeons should not begin the clinical use of any hip prosthesis before they have
thoroughly familiarized themselves with its specific implantation technique. Certain methods
may change with time as further clinical experience is gained. Critical appraisals of such changes
are presented at regularly scheduled surgical instruction courses for which periodic attendance
is advised. Surgical technique brochures and videos are available from DePuy.
Intraoperative
It is recommended that components at least one size larger and one size smaller than were
preoperatively determined be available at surgery to accommodate intraoperative selection of
the appropriate size(s).
Protective covers should be left on until the components are ready to be implanted. Do not use
ceramic femoral heads or any other components if they have been dropped or have impacted a
hard surface. Damage to the component may not be visible, but could cause early failure of the
prosthesis. Before implanting a ceramic femoral head, the male taper on the femoral stem
should be wiped clean of any blood, bone chips or other foreign materials. Foreign material
between the ceramic head and the femoral stem taper may impede proper seating of the head
on the stem. This could affect the performance of the femoral head or the locking mechanism
between the femoral head and the femoral stem.
Do not allow the coated portion of a porous coated or ceramic coated prosthesis to come in
contact with cloth or other fiber releasing materials.
Improper selection, placement, or positioning of implants may result in unusual stress
conditions and a subsequent reduction in the functional life of the implant. Note that a femoral
stem placed in varus increases the stress on the proximal medial femoral cortex and may lead to
loosening of the implant. Increasing the anteversion of an acetabular component in total hip
replacement may result in instability and/or dislocation. Prior to closure, the surgical site should
be thoroughly cleansed of bone chips, extraneous bone cement (if used), ectopic bone, etc.
Foreign particles at the metal/plastic or ceramic/plastic interface may cause excessive wear.
Range of motion should be thoroughly checked for improper mating, instability, or impingement
and corrected as appropriate.
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