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. 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 5.

Performance of patella resurfacing algorithm

NLP labels⟍Gold standard Resurfacing No Resurfacing Keywords
Resurfacing 732 0 (round/oval)... patellar/patella, Patellar... (round/oval/dome), Patellar (was/were) prepared, patellar (were/was) cemented, patellar component, surface of patellar removed, patellar surface was\were osteotomized, patellar was resurfaced, patella was cut, patellar button, patella ream, -patella, -patellar, Postresurfacing
No Resurfacing 5 59
Accuracy = 99.4%
Rules:
Review “Implant Name” or “PREOP DIAGNOSIS” sections
 If finds any of the with patella resurfacing keywords, assign “With Patella resurfacing” after excluding all the mentions like “without patella resurfacing”, “unresurfaced patella”, “patella unresurfaced”, “patella was/were not” and “not to resurface”.
 And, also excludes all “Negative” mentions but keep those within sentences with “no.”,