Knee Replacement Houston Advanced Orthopaedics & Sports Medicine
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iUni® G2 Unicompartmental Knee Resurfacing Device

iUni® G2 Unicompartmental Knee Resurfacing DeviceThe iUni G2 unicompartmental resurfacing device is an FDA cleared and CE Marked implant designed for patients with arthritic damage isolated to either the medial or lateral tibiofemoral compartment of the knee. Together with the iDuo G2, the iUni G2 provides surgeons with a range of partial knee resurfacing options.

How it Works

The patient-specific iUni G2 is designed from a CT scan of an individual patient's knee using the ConforMIS iFit technology. The iFit design process interactively maps the diseased area and defines the extent of misalignment present in the knee. Using the patient-specific bone geometry, iFit defines the shape and size of the femoral and tibial components as well as the disposable instrumentation.

iUni® G2 Unicompartmental Knee Resurfacing DeviceThe cobalt chrome femoral component conforms to the surface of the patient's femoral condyle, replacing the damaged cartilage with a smooth articulating surface. Because of its patient-specific conformity to the subchondral bone, it is a true resurfacing product, requiring only cartilage removal and one small posterior bone cut. The weight bearing portion of the subchondral plate is kept intact.

The geometry of the tibial implant is specified to provide full cortical rim coverage on the tibia, potentially reducing the risk of implant subsidence and loosening. After proper MCL tensioning using the iJig patient-specific instrumentation, a small amount of the tibial plateau is removed to receive the implant.

iUni G2 Features

  • Available for the medial or lateral compartment
  • Preserves bone and future surgical options - minimally invasive, minimally traumatic procedure
  • Precise fit to ensure ROM without impingement or overhang
  • Complete cortical rim coverage to reduce risk of tibial implant subsidence and loosening
  • Anatomic component alignment to reduce implant wear
  • Disposable, patient-specific iJig instrumentation with built-in image guidance
  • Simple, reproducible surgical technique
  • Potential for less post-operative pain and shorter post-operative recovery time

Who is a Candidate

iUni® G2 Unicompartmental Knee Resurfacing DeviceThe iUni G2 was developed for patients with arthritic damage isolated to either the medial or lateral tibiofemoral compartment of the knee, with little to no damage in the patellofemoral compartment.

The bone and cartilage preserving features of the iUni G2 may be especially valuable for young and active patients who are considered too early for traditional knee replacement, but who suffer from arthritis. The iUni G2 allows the patient to preserve their joint for future surgery options, while receiving an implant with the potential to prevent or delay the need for a more invasive surgery.


The ConforMIS Unicondylar Knee Repair System (iUni G2) with curved tibial insert is intended for use in one compartment of the osteoarthritic knee to replace the damaged area of the articular surface in patients with evidence of adequate healthy bone sufficient for support of the implanted components.

Candidates for unicondylar knee repair include those with:

  • joint impairment due to osteoarthritis or traumatic arthritis of the knee
  • previous femoral condyle or tibial plateau fracture, creating loss of function and
  • valgus or varus deformity of the knee.

This implant is intended for cement use only.


  • The following conditions are contraindications for unicondylar knee repair.
  • Active or recent local or systemic infection.
  • Loss of bone or musculature, osteoporosis, neuromuscular or vascular compromise in the area of the joint to be operated to an extent that the procedure is unjustified.
  • Severe instability due to advanced loss of osteochrondral structure.
  • Absence of collateral ligament integrity.
  • Severe (>15°) fixed valgus or varus deformity.
Call David R. Mack for Appointment: (281) 955-7577
Dr. David R. Mack, M.D.
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Dr. Mack is Subspecialty Certified in Orthopaedic Sports Medicine by the American Board of Orthopaedic Surgery

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