Objectives: to identify in the scientific literature how the assessment of knowledge of the nursing team about pressure injuries is conducted, which instruments are used, and their psychometric properties. Methods: integrative review conducted with 44 scientific articles. The search was conducted between October and December 2021 in the following data sources: BDENF, Cinahl, Lilacs, MEDLINE, Scopus, Google Scholar, and Web of Science, using the strategy in Portuguese: ("lesão por pressão" OR "úlcera por pressão" OR "úlcera de decúbito" OR "escara de decúbito") AND enfermagem AND conhecimento, and, in English, ("pressure ulcer" OR "bed sore" OR "bed sores" OR bedsore OR bedsores) AND nursing AND knowledge. Articles published between 2012 and November 2021 were included, with text available in full, in open access, in English, Portuguese, or Spanish, resulting from original research related to care in the hospital area. Results: The most used knowledge assessment instrument was the P-PUKT and its versions, used in 50% of the studies, followed by the PUKAT and its versions. Three studies also used instruments constructed and validated by the authors, five qualitative studies, and four studies used non-validated instruments. Conclusion: Valid instruments to assess knowledge are essential to identify possible failures in patient care. Heterogeneity in the samples and in the classification criteria of the participants' level of knowledge made it impossible to compare the results obtained in the studies, constituting a limitation.