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Unicompartmental knee arthroplasty (UKA) or partial knee replacement is a surgical procedure performed for osteoarthritis of the knee. The procedure involves the replacement of only a part of the knee with an implant. UKA uses the Zimmer Unicompartmental High Flex Knee System (provided by Zimmer Holdings, Inc.), which is implanted through a minimally invasive procedure, and accommodates up to 155° of flexion (bending of the joint).


  • The Zimmer Unicompartmental High Flex Knee System features include:
  • Round-on-flat articulation that provides free movement to the knee joint
  • Extended condyle that aids in high-flexion activities
  • Tibial base plate dimensions that allow maximum bone coverage
  • Pegs, keel and base plate designed to allow stable implant fixation
  • Patient specific, with various sizes
  • Accommodates various surgical approaches (intramedullary, extramedullary, or spacer block) using a common assembly
  • Instruments require minimum exposure and facilitates the procedure without averting the knee cap


  • The Zimmer Unicompartmental High Flex Knee System is indicated for patients with:
  • Osteoarthritis or traumatic arthritis
  • Unicompartmental knee osteoarthritis (osteoarthritis limited to a part of the knee)
  • Fractures to tibial condyle or plateau
  • Varus or valgus deformities (malaligned knee)
  • Revision arthroplasty


The Zimmer implant shows benefits of facilitating minimally invasive procedures, less blood loss, reduced post-procedural pain, shorter hospital stay, quicker recovery and rehabilitation, and earlier mobilization.