Eius Unicompartmental Knee System || Stryker Howmedica Osteonics Corp. || Howmedica International S. de R.L., Raheen Business Park, Limerick, Ireland. || Intended for use in Unicompartmental Knee Arthroplasty (UKA). Surgeon users have identified the following potential advantages of UKA procedures versus Total Knee Arthroplasty procedures generally: conservation of the opposite compartment, preservation of ligaments and patellofemoral articulation, reduced loss of bone stock and lower implant cost. The EIUS UKA is a Resurfacing device that requires the removal of a thin condylar cross-section intended to replace the diseased cartilage only. This allows the surgeon to conserve good quality subchondral bone.