Objective: In the last decades, there has been
a growing interest in exploring surgical procedures with
statistical models to analyze operations in different se?mantic levels. This information is necessary for developing
context-aware intelligent systems, which can assist the
physicians during operations, evaluate procedures after?ward or help the management team to effectively utilize the
operating room. The objective is to extract reliable patterns
from surgical data for the robust estimation of surgical
activities performed during operations. This paper reviews
the state-of-the-art methods for the recognition of highest?level surgical activities, i.e., phases, and focuses on data
and learning algorithms. Methods: Three databases, IEEE
Xplore, Scopus, and PubMed are searched, and additional
studies are added through a manual search. After the
database search, 173 studies are screened and a total of
33 studies are selected for the review. Conclusion: The de?velopment of robust surgical phase recognition algorithms
requires large and diverse datasets, as the task is highly
variable and complex. Much progress has been made, but
publicly available data are still limited in volume and biased
to endoscopic videos. Unsupervised or semi-supervised
learning approaches and active learning methods are pro?posed to lessen the consequences of these challenges.
Additionally, other potential data sources in the operating
room and using different modalities together could be in?vestigated in the future. Significance: The present study
provides a comprehensive review of surgical phase recog?nition algorithms, their generalizability, and point under?investigated areas for possible improvements