M.4 X-lock®

4-point knee brace

  • Secure fit due to physioglide hinge
  • Lock mechanism for easy mobility
  • Waterproof foam padding

 Medical specifications

Functional rigid brace with extension / flexion limitation

The M.4 X-lock is a functional knee orthosis. The product is exclusively to be used for the orthotic fitting of the knee and only on intact skin.


Product benefits

  • Reliable locking when fully extendes. As a result, axial loading is possible in the extended position

  • The compression resulting from the pressure promotes the stability of the meniscus suture

  • Due to the easy conversion during free movement, initial functional excercises are possible when the brace is not under a load

  • Muscle atrophy is prevented

  • Limitations:

  • - Extension limitation at: 0°, 10°, 20°, 30°, 45°

  • - Flexion limitation at: 0°, 10°, 20°, 30°, 45°, 60°, 75°, 90°

  • - Immobilisation at: 0°, 10°, 20°, 30°, 45°

Wearing directions

Please heed the specifications of your physician when using the knee brace, especially with respect to stressing the leg and to knee flexibility. In general, stress the operated leg only in the extended position - the knee brace joints are locked in the extended position (red area in the joint window). This applies until your physician instructs otherwise. When the brace is not stressed (e.g. when you are sitting or lying down), you can unlock the joints (green area in the joint window) and bend your leg to the extent permitted by your physician. BEFORE GETTING UP, however, make sure that the joints are locked in the extended setting and then stand up with your leg stretched. One click and the additional display (red pin is visible on the front edge of the joint) confirms that the mechanism has been snapped in correctly.
Important notes
Only change the extension and flexion limits on instruction 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 middles 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.
Locking mechanism
WARNING! The locking mechanism only works if a 0° extension wedge is inserted. With other wedge settings the lock mechanism does not work.
Fastening the belt eyes
The belt eyes have been adequately fastened and are, to some extent, deliberately mobile. Please do not tighten the screws; they are tight enough. If you apply too much force, you can break off the screws.


Standard colours

Material components

Avional, Velours, Polyester, PU foam

Washing instructions

The pads are water-repellent; nevertheless, they should be wiped off and dried briefly after you take a shower – the same applies to the straps. Soap residues, lotions and ointments can cause skin irritation and material wear.

  • Do not bleach.
  • Leave to dry naturally.
  • Do not iron.
  • Do not dry clean.

With normal use, the hinge mechanism should not require any maintenance, but it can be lubricated with Teflon spray. Check regularly that the joint screws are secure, tighten them if necessary.






Medical specifications


  • Meniscus refixation
  • Postoperative after knee extensor tendon ruptures (patellar tendon, quadriceps)
  • Cartilage surgery in the area of the knee cap and the trochlear groove
  • Postoperative after Fractures of patella
  • Restraint operations of the patella (e.g. MPFL reconstruction)
  • Nonsurgical therapy of patellar dislocations
  • Nonsurgical treatment after cruiate ligament, collateral ligament or meniscus lesions
  • Transfer of tuberositas tibiae
  • postoperative after meniscus implant


  • None

Further information

File download


medi M.4 X-lock® – Instructions for medical staff

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