MILINE Standard Action Ankle Joint User Guide
- June 15, 2024
- MILINE
Table of Contents
MILINE Standard Action Ankle Joint User Guide
Step 1
Correct the cast prior to fabrication. Insert the 9.5mm (3/8″) diameter
alignment axis, included with the MILINE Fabrication Tool Kit, through the
negative cast at the desired position of the ankle axis. Fill the mold with
plaster and when cured, remove the alignment axis from the positive model and
modify.
Step 2
Assemble the fabrication tool for unilateral or bilateral fabrication.
Attach the upright and stirrup to the MILINE fabrication tool using the
appropriate size adapter plate. Set the desired clearance to the positive
model using the included spacers. Note that each spacer gives 3mm (1/8″) of
clearance. For bilateral fabrication, insert both fab tool alignment bushings
into the alignment hole so that they telescope until the spacers touch the
positive model.
For unilateral fabrication using a single fabrication tool, install the shim on the alignment bushing before inserting into the alignment hole in the positive model.
Step 3
Contour the upper bar and stirrup to the desired shape.
Important: Do not mar or bend the stirrup or upper bar where they attach to
the component (Figure 1). Best practice recommends using a smooth jaw vise to
hold the bars by the component attachment points during contouring.
Step 4
After contouring, attach the upper bar(s) and stirrup(s) to the fabrication
tool and insert into the positive model. Create the orthotic shell using the
desired fabrication technique. If thermoforming, or fabricating open pocket
laminated shells (with the bars under the PVA bag), back-fill the bars with
plaster where they contact the positive model. If integrating the bars into a
laminated shell, remove the adapter plate from the tool. Slide the inner PVA
bag over the mold and apply vacuum. Place the adapter plate on the tool, over
the PVA bag, and attach with screws going through the bag.
Step 5
After fabricating, remove the bars from the fabrication tool and wipe clean
using a rag
with solvent. DO NOT grind or blast the bars where they attach to the
component. Protect the areas shown in red using tape before finishing the bars
(Figure 1).
Step 6
Final Assembly
a. The upper bar must be fit to the component. Use a file, or fine sanding
cone to fit the upper bar. The upper bar should require moderate pressure from
a vise, or arbor press to seat the bar into the bar pocket. Failure to
properly fit the upper bar may result in screw loosening. Apply a small drop
of thread locking adhesive to the bar attachment screws (included) and
tighten. Use a torque wrench to torque the bar attachment screws to the value
shown in Table 1.
b. Install the MILINE stirrup with the selected thrust washers (included) to adjust the mediolateral play of the component to the desired stability. Refer to Table 2 for thrust washers included by component size. After selecting the desired washer thickness, use the thrust washer installation tool to hold the thrust washers in alignment with the stirrup as it is pushed into the component body (Figure 2). When the thrust washer installation tool is aligned with the pivot hole, install the pivot bushing, pushing the thrust washer installation tool out of the pivot hole. Apply a small drop of thread locking adhesive to the pivot screw and tighten. Use a torque wrench to torque the pivot screw to the value shown in Table 1.
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