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M.4

®

s

Dear Patient, 
Your doctor has prescribed the functional knee 
brace M.4

®

s for you. Please read through these 

instructions carefully to help ensure that your 
brace is fitted correctly.

 

Indications

ruptures of cruciate ligaments with 

• 

accompanying injuries.
isolated ruptures of the anterior cruciate 

• 

ligament.
ruptures and/or instability of the collateral 

• 

ligaments.
after reconstruction of cruciate ligaments.

• 

for conservative treatment of knee joint 

• 

instability.

Side-Effects / Contraindications

none are currently known.

Setting the flexion / extension limits

extension limit wedge, silver: 
0°, 10°, 20°, 30°, 45°
flexion limit wedge, black: 
0°, 10°, 20°, 30°, 45°, 60°, 75°, 90°, 120°
can be immobilized at: 0°, 10°, 20°, 30°, 45°
for immobilizing the orthosis, first insert the 
flexion wedge and then the corresponding 
extension wedge. the medial (inside) and the 
lateral (outside) wedge settings must always be 
the same.

10

1. 

° extension and 90° flexion wedges are 

pre-installed in your knee brace. 
t

2.  o change the wedges, simply remove the 

joint cover. 
r

3.  eplacement extension wedges (silver) can 

be found in the wedge set marked ‘r-e’ and 
‘L-e’. slide the new wedge into the joint from 
the front, and secure it by tightening the 
screws. insert the wedge so that the letter 
shown on the joint plate points upwards  
(r or L). now insert the screw and tighten. 
t

4.  o replace the black flexion wedge, loosen 

the screw and pull the wedge out from the 
back of the orthosis. select the desired wedge 
from the set marked ‘r-f’ and ‘L-f’.  
insert the wedge so that the letter shown on 
the joint plate points upwards (r or L). now  

insert the screw and tighten.
B

5.  end and flex the brace ‘joint’ a couple of 

times and check that the wedges are positioned 
correctly. finally, secure the joint cover.

Important notes

changes to the extension and flexion limits 
should only be made with instructions from 
your doctor or orthotist. in order to prevent  
hyperextension, always insert extension wedges 
or 0° wedges. the wedges define the exact 
excursion of the orthosis. in difficult soft-tissue 
conditions, e.g. where the soft-tissues are under 
compression, it may be necessary to insert the 
larger wedge to limit the joint movement to the 
desired excursion. in addition, make sure that 
the orthosis joints are correctly positioned: the 
middle of the joints should be level with the 
upper border of the patella. the joint must lie 
behind the midline of the leg.

Shaping the orthosis

When shaping the orthosis, please ensure that 
the joints stay parallel. this guarantees that the 
orthosis will function well and run easily and 
that there is no excessive wear.  

Fastening the belt eyes

the belt eyes have been adequately fastened 
and are, to some extent, deliberately mobile. 
please do not tighten the screws. if too much 
force is applied, the screws may break.

Fitting instructions

open all the straps. sit on the edge of a chair, 

• 

pull the brace up the affected leg and flex your 
knee to 45°. position the joints so that the  
center of the hinges (extension wedges) are 
level with the top edge of the kneecap. Make 
sure that the brace is not twisted on your leg.
first, fasten the lower front calf strap (strap 

• 

#1), then the upper back thigh strap (#2). 
Keep your knee in a flexed position and push 
both joints towards the back of the leg.
now fasten the lower back thigh strap (#

• 

3). 

Make sure that the hinge joints are not  
positioned in front of the midline of the leg.
now fasten the upper front calf strap (#

• 

4). 

then the upper back calf strap (#5), and finally 
the front thigh strap (#6).
Bend your knee slightly a few times and refasten 

• 

the straps again in the order described above to 
prevent the brace slipping.

english

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