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protect.4 OA

4-point rigid knee orthosis

  • Exact and effective valgus or varus pressure
  • Cushioned frame padding
  • Ultraflat and very light weight

Shop online  Medical specifications

4-point rigid knee orthosis for control of anterior and posterior tibial translation. 3-point off-loader for varus- or valgus pressure relief.

protect.4 OA is a brace for varus/valgus pressure relief. The product is exclusively to be used for the orthotic fitting of the knee and only on unbroken skin.


Product benefits

  • Off-loading system due to 3-point-principle

  • Exact and effective valgus or varus pressure exerted close to the knee joint

  • Wide, well cushioned frame padding for the 3-point pressure relief system

  • Malleable frame design to reduce torsional forces

  • Ultraflat, very light weight and non protruding frame and hinge construction

  • Undersleeve available upon request

How does it work?/Mode of action

4-point rigid knee orthosis for control of anterior and posterior tibial translation
Pressure relief of the medial or lateral joint compartment by the 3-point-principle which off-loads the affected compartment into a varus or valgus position
Stabilisation of the knee joint by the 4-point principle to counteract knee instability which often causes osteoarthritis
Safeguards against hyperextension and offers limitation of flexion and extension: extension limitation at: 0°, 10°, 20°, 30°, 45°; flexion limitation at: 0°, 10°, 20°, 30°, 45°, 60°, 75°, 90°, 120°; immobilisation at: 0°, 10°, 20°, 30°, 45°

Donning/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 centres of the hinges (extension wedges) are about 2,5 cm above the kneecap and slightly past midline of the leg. Make sure that the brace is not twisted on your leg.
First fasten the lower front calf strap, then the upper back thigh strap. Keep your knee in a flexed position and push both joints towards the back of the leg.
Now fasten the lower back thigh strap. Make sure that you do not have the hinge joints positioned in front of the midline of the leg.
Now fasten the upper front calf strap. Then the upper back calf strap, and finally the front thigh strap.
Bend your knee slightly a few times and refasten the straps again in the order described above to prevent the brace slipping.

Setting the flexion / extension limits
Extension limit wedge (limits extension): 0°, 10°, 20°, 30°, 45°
Flexion limit wedge (limits flexion): 0°, 10°, 20°, 30°, 45°, 60°, 75°, 90°
Can be immobilised at: 0°, 10°, 20°, 30°, 45°
The medial (inside) and the lateral (outside) wedge settings must always be the same.

10° extension wedges are preinstalled in your knee brace as standard. They are found in the front aspect of the brace’s hinge joint.
To replace the wedges first loosen the screws in the joint cover, then take the cover off.
To change the silver extension wedge loosen the screw and pull the wedge out from the front of the joint. You will find the replacement wedge in the wedge set. It is marked with the corresponding wedge setting. Slide the new extension wedge into the front of the joint. Now replace the screw in the threaded hole and screw it tight.
The flexion wedges are installed from the back of the joint. Select the suitable wedge from the wedge set. Insert the wedge and secure it with the appropriate screw (enclosed).
Bend and flex the brace ‘joint’ a couple of times and check that the wedges are positioned correctly. Finally, secure the joint cover.


Standard colours

Material components

Aluminum, Polyamide, PU

Washing instructions

Soap residues, lotions and ointments can cause skin irritation and material wear.
Wash the paddings and covers by hand, preferably using medi clean washing agent.
Do not bleach.
Leave to dry naturally.
Do not iron.
Do not dry clean.
Check regularly that the joint screws are secure, tighten them if necessary.




Medical specifications


  • Conservative treatment of advanced unilateral osteoarthritis or complex ligamentous instability, particularly in combination with unilateral osteoarthritis
  • Post-operative pressure relief and compartmental protection after fractures of the tibial head, cartilage surgery, meniscusrefixation, correction osteotomy
  • Instability of the cruciate ligaments with pressure relief of the medial or lateral compartment
  • For functional pre- or post-operative care of knee instabilities


  • Medial and lateral osteoarthritis

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