Stryker Scorpio TS User Manual

Scorpio®TS

Single Axis Revision

Knee System

Orthopaedics

Scorpio TS
Trial Cutting Guide Surgical
Protocol

Scorpio®TS

Single Axis Revision

Knee System

Orthopaedics

Scorpio TS

Trial Cutting Guide Surgical Protocol

Acknowledgements

Stryker Orthopaedics would like to thank
Dr. Masini for his help in developing the
Scorpio Trial Cutting Guide.

Michael A. Masini, MD

Ann Arbor Bone and Joint Surgery
St. Joseph Mercy Hospital
Ann Arbor, MI

Clinical Instructor in Orthopaedic Surgery
University of Michigan
Ann Arbor, MI

Introduction

This surgical protocol is a supplement
to the Scorpio Total Stabilizer Revision
Knee System Surgical Protocol
(Lit No. LSTS/ST).

The Scorpio Trial Cutting Guide is an
intramedullary based instrumentation
system focused on the restoration of the
joint line and proper flexion-extension
gap assessment.

1

Tibial and Femoral Canal Preparation

Scorpio Trial Cutting Guide

Tibial Preparation

Prepare the tibia following the Scorpio
Total Stabilizer Revision Knee System
Surgical Protocol (Lit. No. LSTS/ST, pages
1- 5). If an offset is needed, use the tibial
offset reamer to prepare for the tibial
offset. Insert the assembled trial into the
tibia (Figure 1 and Figure 2).

Note: The Scorpio Trial Cutting
Guide (TCG) is designed for use
with its own mating tibial insert
trial. The trial insert does not have
a post to allow for more accurate
assessment of the ligaments
during surgery.

Femoral Canal Preparation

Prepare the femoral canal to accept a
stem as described in the Scorpio Total
Stabilizer Revision Knee System Surgical
Protocol (Lit. No. LSTS/ST, page 5). If an
offset is needed, use the femoral offset
reamer to prepare for the femoral offset
(Lit. No. LSTS/ST, page 9) (Figure 3).

Figure 1 Tibial Canal Preparation Figure 2 Tibial Trial Assembly and

Insertion

Femoral Offset Reamer

8200-0095

Reamer Depth Stop

8200-0047 80mm stem with offset
8200-0048 155mm stem with offset

2

Figure 3 Femoral Canal Preparation

Tibial Boss/Offset Reamer

8200-0015

Command T-Handle

6266-5-401

IM Reamers

6633-9-408 8mm
6633-9-409 9mm
6633-9-410 10mm
6633-9-411 11mm
6633-9-412 12mm
6633-9-413 13mm
6633-9-414 14mm
6633-9-415 15mm
6633-9-416 16mm
6633-9-417 17mm
6633-9-418 18mm
6633-9-419 19mm
6633-9-420 20mm
6633-9-421 21mm
6633-9-422 22mm
6633-9-423 23mm

Femoral/Tibial Trial Selection

Scorpio Trial Cutting Guide

Femoral/Tibial Trial Selection

Select the appropriate size femoral trial
cutting guide, offset adapter, and
corresponding tibial insert trial (Table 1).

Appropriate sizing can be achieved
through the use of:

• Previous operative notes

• Size of the original implant removed

• X-ray templates

Femoral
Cutting Guide

Table 1 Trial Cutting Guide Instrument Sizes

Category Sizes

Femoral Cutting Guides 3, 5, 7, 9, 11, 13

Offset Adapter 0mm, 2mm, 4mm, 6mm, 8mm

Tibial Insert Trial Sizes 3, 5, 7, 9, 11, 13

Tibial Insert Trial Thickness 10mm, 12mm, 14mm, 16mm , 18mm, 21mm, 24mm

The Scorpio Trial Cutting Guide (TCG)
can be assembled for either a left or right
knee. Assemble the offset adapter into the
housing of the TCG so the offset adapter
is pointing to the appropriate left or right
orientation (Figure 4).

Figure 4 Trial Cutting Guide in “Right” Orientation

Trial Cutting Guide

8200-5003
8200-5005
8200-5007
8200-5009
8200-5011
8200-5013

3

Femoral/Tibial Trial Selection (continued)

Scorpio Trial Cutting Guide

Assembly

Assemble the trial cutting guide, offset
adapter, and appropriate size trial stem
as shown (Figure 5).

A neutral offset adapter may be used
initially to construct the trial cutting
guide assembly until the need for a
femoral offset is determined.

First, assemble the trial stem to the offset
adapter, then assemble the offset adapter
into the Trial Cutting Guide housing and
secure the anterior set screw. Once “finger
tight” pressure is achieved, rotate
counterclockwise 1/2 turn to allow the
offset adapter to rotate freely. The anterior
set screw will be fully secured after the
appropriate offset and rotation is
determined (Figure 6).

Note: Rotating counterclockwise
1/2 turn will allow the offset
adapter to rotate freely without
disassembling from the Trial
Cutting Guide housing. Rotating
counterclockwise more than 1/2
turn will cause the offset adapter
to fall out of the Trial Cutting Guide
housing.

Trial
Stem

Offset
Adapter

Figure 6 Set Screw Assembly

Set
Screw

Trial Cutting
Guide
Housing

Trial
Cutting Guide

Figure 5 Trial Cutting Guide
Assembly

Torx Screwdriver

8200-5110

4

Tibial Insert Trial

T72-7-XXYY
XX = 03, 05, 07, 09, 11
YY = 10, 12, 14, 16, 18, 21, 24

Offset Adapter

8200-5100
8200-5102
8200-5104
8200-5106
8200-5108

Trial Cutting Guide Orientation

Scorpio Trial Cutting Guide

Note: Femoral chamfer cuts cannot
be made with the TCG. However, if
bone loss is minimal and it is
determined that chamfer cuts are
required, the Scorpio Total
Stabilizer (TS) All-In-One Cutting
Block may be used to make
chamfer cuts (Lit. No. LSTS/ST,
Page 8).

Joint Line Restoration

Insert the TCG into the femoral canal
(Figure 7) and align the TCG medial
epicondyle (ME) scribe line reference mark
with the medial epicondyle (Figure 8). The
ME scribe line is 28mm from the distal
surface of the TCG. When the ME scribe
line is in line with the medial epicondyle,
the distal surface of the TCG will be
approximately located at the joint line.
(The joint line can also be estimated
using pre-operative radiographs and
anatomic landmarks.)

Figure 7 TCG Femoral Canal
Insertion

ME Scribe

Medial

Figure 8 Joint Line Restoration to
Medial Epicondyle

Place an initial fixation pin in the middle
of the medial slot on the TCG (Figure 9
and Figure 10). Pinning the medial slot
will fix the proximal/distal position while
allowing for slight internal and external
rotation of the TCG.

1/8" Headless Pins

7650-1038

Figure 9 Initial Fixation Pin Insertion Figure 10 Initial Fixation Pin –

Extension

Joint Line Scale

8200-0065

5