Unicompartmental arthroplasty is a replacement of the joint in only one of the three knee compartments.

Tibiofemoral UKR.

Patellofemoral UKR.
Synonyms:
unicompartmental knee replacement
UKR
UKA
PKR
partial knee replacement
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FORUM DISCUSSIONS
Running on Partial Knee Replacement(s)
CLINICAL PUBLICATIONS
Effect of Age on Cost-Effectiveness of Unicompartmental Knee Arthroplasty Compared with Total Knee Arthroplasty in the U.S.. Ghomrawi HM, Eggman AE and Pearle AD. J Bone Joint Surg Am. 2015 Mar 4; 97(5): 396–402.