M.4®s OA

Rigid orthosis for varus/valgus pressure relief
  • Relief by the use of the 3-point relief principle
  • Tried-and-tested relief machanism close to the joint
  • Pain reduction for increased mobility and activity
Product variety
Standard colours
Suitable for
Men's sizing
Women's sizing
Material components
Avional, velours, polyester, PU foam
Prescribed by a doctor
This is supported by your health insurance

M.4®s OA - rigid orthosis for relief and stabilisation of the knee

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The M.4®s OA is a rigid orthosis for the knee. Patients with a varus deformity (bow legs) mostly suffer pain on the inside of the knee, whereas a valgus deformity (knock knees) often leads to symptoms on the outside of the knee. With its relief mechanism close to the joint, the M.4®s OA makes it possible to relieve the knee joint. The 3-point pressure relief principle holds the joint in the correct alignment and prevents the leg from swinging out sideways into a painful malalignment: the pressure on the painful side of the joint is reduced. Thus, step by step, the patient can regain more mobility and activity in everyday life. At the same time, the 4-point principle of the M.4s OA knee brace stabilises the knee joint.

M.4®s OA is suitable for all indications that require unicompartmental relief based on the 3-point principle, physiological guidance and stabilisation based on the 4-point principle and, where necessary, a limitation of the range of movement of the knee joint, for example:

  • Severe medial or lateral gonarthrosis (at least level III) combined with ligament instability
  • Unicompartmental relief at serve gonarthrosis before HTO (brace test)
  • Cartilage surgery or chondroplasty
  • Meniscus intervention

The rigid orthosis for the knee is characterised by its flat and lightweight aluminium frame construction. Thanks to the flat design, the M.4®s OA can often be worn comfortably under clothing. It also has pads made of anti-slip material. Handling is made simpler and safer by numbered straps. Movable buckles support the proper fit on the leg. The comprehensive wedge set supplied with the M.4®s OA knee brace enables an individual limitation of straightening (extension) or bending (flexion) as needed. Thanks to the comprehensive pad set, the brace can be adapted to the patient's needs. Movable buckles adapt automatically to movements and contribute to the proper fit of the brace on the leg.

Product features
  • Relief of the lateral or medial compartment using the 3-point-principle
  • Stabilisation of the knee joint via the 4-point-stabilisation-principle
  • Varus and valgus relief can be adjusted easily and individually by relief mechanism close to the hinge joint
  • Anatomically pre-moulded, twist-resistant frame geometry.
  • Slim design: Flat and lightweight frame design provides that the brace is as comfortable to wear as possible under clothing.
  • Numbered straps provide easy and secure usage
  • The movable D-rings adjust flexibly upon movement and provides that the brace supports secure fit on the leg
  • Limitations:
    - Extension: 0°, 10°, 20°, 30°, 45°
    - Flexion:  0°, 10°, 20°, 30°, 45°, 60°, 75°, 90°
    - Immobilisation: 0°, 10°, 20°, 30°, 45°
Intended purpose

Rigid brace designed  for relief and stabilisation of the knee joint.


All indications requiring unicompartimental relief by 3 point principle and additional physiological guidance and stabilization by 4 point principle and if necessary limitations of Range of motion such as:

  • Severe medial or lateral gonarthrosis (at least level III) combined with ligament instability
  • Unicompartmental relief at serve gonarthrosis before HTO (brace test)
  • Cartilage surgery or chondroplasty
  • Meniscus intervention
  • Combined lateral and medial osteoarthitis
M.4®s OA – instructions for patients
M.4®s OA – Instructions for medical staff
Size table
15 cm6“5 cm2“
Circumferences in cmkT31 - 3737-4545 - 5151 - 5757 - 6565 - 74
article numberG.02▢.◯01G.02▢.◯02G.02▢.◯03G.02▢.◯04G.02▢.◯05G.02▢.◯06
M.4®s OA shortMeasureXSSMLXLXXL
Circumferences in cmkT31 - 3737-4545 - 5151 - 5757 - 6565 - 74
article numberG.03▢.◯01G.03▢.◯02G.03▢.◯03G.03▢.◯04G.03▢.◯05G.03▢.◯06
◯ = fill in for orientation2left
M.4®s OA NumberVariant
▢ = fill in for variant 7Varus
M.4®s OA shortVariantNumber
▢ = fill in for variant Varus4
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Contact for usersContact for users
Contact us
+49 921 912-0
+49 921 912-783
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