UNI KROMA® is an anatomical, fixed-bearing, unicompartmental prosthesis.
The tibial component is available in a metal-backed version (cemented or uncemented) and an all-polyethylene (all PE) version.
may be performed using a conventional technique or with custom instrumentation.
The instrumentation is original in that it is HYBRID.

UNI KROMA® is manufactured by OneOrtho Medical and distributed by SERF.


Characteristics and materials

Characteristics :

  • The UNI KROMA® prosthesis is anatomical as it is comprised of a femoral component, a tibial baseplate and an insert which are asymmetrical: Internal Left/External Right or Internal Right/External Left.
  • The femoral component and tibial baseplate are available in 6 sizes.
  • For the metal-backed version, the insert is available in 6 sizes and 4 thicknesses.
  • The all-PE baseplate is available in 6 sizes and 5 thicknesses.

Materials :

  • Cemented and cementless femoral component: Cobalt Chrome (CoCr) with dual coating for the cementless version (Titanium spray T40 + HA).
  • Cementless tibial baseplate: Titanium (TA6V) with dual coating (Titanium spray T40 + HA).
  • Cemented tibial baseplate: Cobalt Chrome (CoCr).
  • All-PE baseplate and insert: Polyethylene.


The instrumentation is called “hybrid” because it combines metallic parts and disposable polyamide parts (Single Use).

The technique of fitting with tailor-made instrumentation makes it possible to make the tibial cuts AND the distal femoral cut.


The UNI KROMA® prosthesis is an unicompartmental prosthesis which is recommended in the following cases :

  • Primary or secondary isolated osteoarthritis of the internal or external femorotibial compartment of the knee;
  • Isolated necrosis of the internal or external condyle of the knee.

The prosthesis is indicated for patients whose bones have stopped growing.

Contraindications of the UNI KROMA® prosthesis are :


  • Inflammatory rheumatic and microcrystalline diseases;
  • Functional deficit of cruciate and/or collateral ligaments;
  • Significant irreducible flexum or recurvatum;
  • Contralateral femorotibial compartment arthritic disease;
  • Major frontal plane bone malalignment.


  • Acute or chronic infectious conditions whatever their aetiology or location;
  • Neuromuscular or psychiatric conditions which could result in the failure of the fixing and post-operative care;
  • Inappropriate or inadequate bone support preventing correct anchoring of the prosthesis;
  • Physical activity;
  • Known allergy to one of the implant materials;
  • Pregnant women.


Surgical technique