Unicompartmental means relating to one of the three compartments of the knee.
The dotted lines in the illustration artificially cut the femur and tibia to show you that in fact there are two tibiofemoral areas of articulation. There is one patellofemoral compartment, and medial tibialfemoral compartment, and a lateral tibiofemoral compartment.
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Unicompartmental knee arthroplasty: Current indications, technical issues and results Rodríguez-Merchán EC and Gómez-Cardero P. EFORT Open Rev. 2018 Jun; 3(6): 363–373.