. Author manuscript; available in PMC: 2022 Mar 1.

Published in final edited form as: J Arthroplasty. 2020 Oct 10;36(3):922–926. doi: 10.1016/j.arth.2020.09.029

Table 2.

Performance of category of surgery algorithm

NLP labels⟍Gold standard	Uni	PTKA	PFEM	Keywords
Unicompartmental (Uni)	188	1	0	Medial, unicom
Primary TKA (PTKA)	5	199	0	TKA, Total knee, Total
Patellafemoral (PFEM)	1	0	28	Patellofemoral
Accuracy = 98.3%
Rules: Review “PROCEDURE” section If finds any PFEM keywords, assign “PFEM” If finds any PTKA keywords, assign “PTKA” If finds any UNI keywords, assign “UNI” If finds keywords of different types, prioritize to “PTKA,” “UNI,” and “PFEM” in order.