Replacing part of the knee joint with an implant - this could be one of the tibiofemoral joints or/and the patellofemoral joint.

Partial knee arthroplasty replacing one tibiofemoral compartment, but leaving the other intact, as well as the ligaments.
Synonyms:
Partial knee replacement
Unicompartmental knee replacement
Patellofemoral resurfacing
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CLINICAL PUBLICATIONS
Patient relevant outcomes of unicompartmental versus total knee replacement: systematic review and meta-analysis. Wilson HA, Middleton R, Abram SGF, Smith S, Alvand A, Jackson WF, Bottomley N, Hopewell S and Price AJ. BMJ. 2019; 364: l352.