Unicompartmental Knee Arthroplasty

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Introduction The evolution of the basic technical principles of unicompartmental arthroplasty design and implantation are discussed in Chapters 1 , 3 , 6 and 7 . These should endure for years to come. Innovative technological advances, however, will appear, evolve,…

One of the principal advantages of unicompartmental knee arthroplasty (UKA) is its conservative nature. Ideally, after a UKA, any future revision can be carried out with the use of primary total knee arthroplasty (TKA) components and the result can be…

Although the “classic” indication for unicompartmental knee arthroplasty (UKA) is isolated end-stage osteoarthritis of the medial or lateral compartment in the elderly patient with an intact anterior cruciate ligament (ACL), other potential indications exist. These “outliers” include selected patients with…

Indications The indications for lateral unicompartmental knee arthroplasty (UKA) are similar to those for medial UKA. The incidence of its need, however, is much less than that for medial replacement. In most experienced UKA practices, lateral arthroplasty comprises about 10%…

The rationale for a mobile-bearing articulation Mobile-bearing unicompartmental components were introduced in an attempt to increase the longevity of the prosthesis by maximizing the articular contact area, thereby reducing stress on the polyethylene and minimizing wear. They might also reduce…

Intraoperative confirmation of patient candidacy Even if a unicompartmental knee arthroplasty (UKA) is planned for a patient based on preoperative radiographs and physical examination, the surgeon must confirm at arthrotomy that the patient is an appropriate candidate. Both cruciate ligaments…

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Reasons for failure of unicompartmental knee arthroplasty (UKA) include improper patient selection, poor prosthetic design, improper surgical technique, and pain of unknown origin. Modes of failure include prosthetic loosening and wear, secondary degeneration of an unresurfaced compartment, instability, and stress…

Unicompartmental components have been available for over 50 years, beginning with designs such as the Polycentric Knee, and the Marmor Knee prostheses. , Many of these early designs were also advocated for bicompartmental arthroplasty, but their success was hindered by…