OMNI ARC HIP SYSTEM User manual

OMNI ARC HIP SYSTEM
SURGICAL TECHNIQUE

Table of Contents
Indications & Contraindications
Technique at a Glance
Femoral Canal Preparation
Implant Trialing
Implant Insertion
Implant Removal
Implant Sizing
Instrument List
TABLE OF CONTENTS
Note: Please refer to the Product Insert (Instructions for Use) for important information pertaining
to the product description and handling, indications for use, warnings and precautions, possible
adverse eects, and contraindications.
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Indications for Use:
The OMNI ARC™ Hip Stem is intended for use as the femoral component of a primary or revision total hip
replacement when used with the OMNI Interface™ Acetabular System. The OMNI Interface Acetabular
System articulates with the OMNI Modular Femoral Head (Cobalt Chromium or Ceramic). The femoral hip
stem is intended for uncemented fixation and single use implantation. These prostheses may be used for hip
arthroplasty to treat the following conditions, as appropriate:
• Non-inflammatory degenerative joint disease, including osteoarthritis and avascular necrosis;
• Rheumatoid arthritis;
• Correction of functional deformity;
• Congenital dislocation;
• Revision procedures where other treatments or devices have failed;
• Femoral neck and trochanteric fractures of the proximal femur.
The ARC Hip Stem is also intended for use in hemiarthroplasty when used with the OMNI Bipolar Head. For
further details, please refer to the OMNI Bipolar Head Instructions for Use.
Contraindications
Absolute contraindications include:
• Infection or sepsis or osteomyelitis;
• Insucient bone structure or quality that may aect the stability of the implant;
• Rapid joint destruction or bone absorption;
• Skeletal immaturity;
• Muscular, ligamentous, neurological, vascular deficiencies or poor skin coverage that may
compromise the aected extremity;
• Alcoholism or other addictions;
• Sensitivity to the implant materials;
• High levels of physical activity (e.g. competitive sports, heavy physical labor);
• Obesity that can produce loads on the prosthesis that can lead to failure of the fixation of the
device or the device itself;
• Use of a head oset greater than +7mm.
Relative contraindications include:
• Uncooperative patient or a patient with neurological disorders and incapable of following
instruction;
• Metabolic disorders that may impair bone formation or bone quality;
• Distant foci of infections.
INDICATIONS & CONTRAINDICATIONS
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OMNI ARC HIP SYSTEM SURGICAL TECHNIQUE

SURGICAL TECHNIQUE AT-A-GLANCE
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Resect Femoral Neck Open Femoral Canal Rasp Femoral Canal
Trial Neck Options Trial Head Options Implant Final Stem
Implant Femoral Head Implant Removal
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Femoral Neck Resection
The neck resection for the ARC stem is typically
conservative. The recommended location of
the osteotomy is in Zone B as described in
Figure 1. This will provide the most options for
restoring the proper leg length and oset.
Zone A : 0-5mm Sub Capital
Zone B : 5-10mm Sub Capital
Zone C : >10mm Sub Capital
Fine tuning the cut may be necessary after an
initial assessment during trialing. It is important
to make the initial cut conservative to preserve
the option of resecting additional bone if
needed.
Make the cut perpendicular to the neck axis to
ensure uniform engagement between the bone
and the proximal stem. The Neck Resection
Guide is included in the instrument set for
additional reference. (Fig. 2)
FEMORAL CANAL PREPARATION
A
B
C
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OMNI ARC HIP SYSTEM SURGICAL TECHNIQUE
Figure 2
Figure 1

Opening Femoral Canal
Open the femoral canal using the Starter Awl.
Note the direction of the tip of the Starter Awl
relative to the handle. (Fig. 3) Apply light
pressure on the handle laterally (towards the
greater trochanter) as the Awl is advanced to
help guide the tip on a curved path along the
calcar.
Using the Canal Finder, expand the opening
created by the Awl to prepare for rasping.
Continue to follow the medial curve, working
the handle back and forth to expand the canal
opening. (Fig. 4)
Proximal Canal Preparation
Utilize the Starter Rasp to begin preparing the
proximal femur. Like the Starter Awl, apply
light pressure on the handle laterally (towards
the greater trochanter) as the Starter Rasp is
advanced to help guide the tip on a curved
path along the calcar. The Starter Rasp is fully
seated when the transition of the teeth and
handle is flush with the neck cut. (Fig. 5).
FEMORAL CANAL PREPARATION
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Figure 3
Figure 5
Figure 4

Initial Trialing with the Rasp
Once the final Rasp has been seated, begin by
attaching the Neutral Neck Trial (Fig 6). Attach
the appropriate Head Trial to the Neutral Neck
Trial and reduce the hip joint (Fig 7).
Conduct a thorough range of motion anlysis to
check for bony impingement.
Assess the stability and leg length. If necessary,
change the neck trial and/or head trial and
repeat trial reduction until the desired result is
achieved.
Refer to the “Head Center Position” table (page
10) of this technique to see how dierent neck
and head combinations aect leg length and
oset.
Reduce the hip and assess the joint mechanics.
If the hip is too tight, it may be appropriate to
resect a little more bone from the femoral neck.
If the hip is loose, an increased head trial should
be used when performing trial reduction with
the final Stem.
After completing the initial trial reduction,
remove the Rasp.
IMPLANT TRIALING
Trial Color
Black/Brown
Gray
Dark Blue
Head Trial
-3.5 mm
+0
+3.5 mm
Green +7 mm
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OMNI ARC HIP SYSTEM SURGICAL TECHNIQUE
Figure 6
Figure 7

Stem Insertion
Insert the selected ARC Stem into the femoral
canal and push the implant into position as
far as possible with hand pressure. Use the
Monoblock Stem Inserter by placing the
round tip of the impactor into the lateral stem
impactor indent on the stem. (Fig 8)
Impact the Stem until the prosthesis is level
with the neck resection. The edge of the
proximal coating should be flush with the
neck resection. However, depending on bone
quality and femoral preparation technique,
the stem may sit a couple of millimeters proud
of the resected surface. This can also be
aected by how planer the neck resection was
prepared.
Caution: Do not excessively impact the stem.
Excessively impacting the stem may result
in bone fracture. If stem does not seat with
normal impaction, consider re-inserting the
Rasp to clear away additional bone.
Femoral Head Impaction
The selected femoral head implant is then
inserted over the neck trunnion and impacted
using the supplied femoral head impactor.
(Fig 9)
NOTE: All taper surfaces should be thoroughly
cleaned and dried prior to inserting the neck
into the stem.
IMPLANT INSERTION
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Figure 8
Figure 9

Attach the Monoblock Stem Extractor Adaptor
to the end of the Slap Hammer. Slide the
U-shaped stem extractor slot onto the implant
neck below the neck trunnion and turn the
locking thread until tight. (Fig. 10)
Apply quick, short strikes with the Slap Hammer
Weight to remove the Stem from the femur.
Frequently check the connection of the Slap
Hammer to the Neck Removal Adaptor to the
neck and re-tighten, if necessary.
IMPLANT REMOVAL
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OMNI ARC HIP SYSTEM SURGICAL TECHNIQUE
Figure 10

IMPLANT SIZING
Product
Code Size A B C*
HC-21000 0 80 mm 90 mm 100 mm
HC-21001 1 80 mm 90 mm 100 mm
HC-21002 2 90 mm 100 mm 115 mm
HC-21003 3 100 mm 111 mm 126 mm
HC-21004 4 110 mm 121 mm 137 mm
HC-21005 5 120 mm 132 mm 147 mm
If the trial reduction is too tight, even when using a -3.5 mm oset Head Trial, additional bone should be
resected from the femoral neck. If the trial reduction is too loose, even when using a +7 mm oset Head
Trial, it may be necessary to convert to an OMNI K1™ or K2™ stem.
The table below shows the smallest K Series stem corresponding to the final ARC Rasp or Femoral Implant
that was used.
ARC Rasp or Stem Size OMNI K1-K2 Stem Size
0 2
1 3
2 4
3 6
4 7
5 10
A
BC
OMNI ARC™ Sizing Chart
*Measured to neutral head/neck configuration. For other head/neck
options, see OMNI ARC Head Centers for relative leg length.
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